{ "schemaVersion": 1, "checkedAt": "2026-10-17 Asia/Shanghai", "publicCopy": { "basenameOnly": true, "description": "Actual completed native BMP-output evidence; initial preparation product0/notYetVerified fields are omitted from public input facts." }, "nativeBytesUnmodified": true, "inputVerification": { "checks": 40, "passed": 40, "failed": 0 }, "primaryVerification": { "checks": 56, "passed": 56, "failed": 0 }, "independentVerification": { "checks": 59, "passed": 59, "failed": 0 }, "independentBmpParserVerification": { "checks": 30, "passed": 30, "failed": 0 }, "verificationCountsKeptSeparate": true, "inputFacts": { "createdAt": "2026-10-17 Asia/Shanghai", "fixtureFile": "synthetic-bitmap.bmp", "provenance": "Completely self-authored RGB drawing with original 5x7 bitmap glyphs; BMP file header, BITMAPINFOHEADER and bottom-up padded BGR rows written explicitly by prepare_bmp_input.py.", "bytes": 771578, "sha256": "00bb63d145385ec1e8168a33a630e13dd19b90f082d5fcafe0341cf0c63021d6", "magicHex": "424d", "magicAscii": "BM", "fileHeader": { "bfType": "BM", "bfSize": 771578, "bfReserved1": 0, "bfReserved2": 0, "bfOffBits": 54 }, "dibHeader": { "biSize": 40, "type": "BITMAPINFOHEADER", "biWidth": 641, "biHeight": 401, "positiveHeightBottomUp": true, "biPlanes": 1, "biBitCount": 24, "biCompression": 0, "compressionName": "BI_RGB", "biSizeImage": 771524, "biXPelsPerMeter": 0, "biYPelsPerMeter": 0, "biClrUsed": 0, "biClrImportant": 0 }, "rowBytesWithoutPadding": 1923, "rowStride": 1924, "paddingBytesPerRow": 1, "paddingByteHex": "00", "rowStorage": "BGR triples, bottom row first; one zero padding byte after every row", "decodedRGB": { "width": 641, "height": 401, "channels": 3, "mode": "RGB", "bytes": 771123, "sha256": "191b570af298a155112b83077472d67bd215cc0b660820b249a538a587628902", "ordering": "top-to-bottom RGB triples" }, "alpha": { "present": false, "reason": "24-bit BI_RGB stores BGR triples without an alpha channel; this fixture is wholly opaque" }, "icc": { "present": false, "reason": "40-byte BITMAPINFOHEADER has no embedded-profile fields; pixel data immediately follows the headers and reaches exact EOF" }, "physicalDensity": { "xPelsPerMeter": 0, "yPelsPerMeter": 0, "meaning": "Unspecified; no DPI claim or conversion setting is implied" }, "cornerSamples": { "A": { "xy": [ 20, 20 ], "rgb": [ 214, 63, 69 ] }, "B": { "xy": [ 570, 20 ], "rgb": [ 35, 122, 67 ] }, "C": { "xy": [ 20, 330 ], "rgb": [ 36, 93, 202 ] }, "D": { "xy": [ 570, 330 ], "rgb": [ 131, 62, 178 ] } }, "gradient": { "box": [ 96, 164, 544, 270 ], "rgbStops": [ [ 24, 61, 132 ], [ 21, 137, 158 ], [ 82, 170, 94 ], [ 227, 169, 62 ], [ 215, 64, 80 ] ] }, "arrowSample": { "xy": [ 320, 86 ], "rgb": [ 25, 39, 59 ], "direction": "up" }, "fineLines": [ { "from": [ 103, 306 ], "to": [ 537, 306 ], "thicknessPixels": 1 }, { "from": [ 103, 316 ], "to": [ 537, 317 ], "thicknessPixels": 2 }, { "from": [ 103, 328 ], "to": [ 537, 330 ], "thicknessPixels": 3 } ], "pillowReadback": { "format": "BMP", "mode": "RGB", "size": [ 641, 401 ], "rgbSha256": "191b570af298a155112b83077472d67bd215cc0b660820b249a538a587628902", "hasAlphaBand": false, "iccProfilePresent": false } }, "primaryObservation": { "stage": "actual_native_output_analysis", "checkedAt": "2026-10-17 Asia/Shanghai", "reportFilesUseBasenamesOnly": true, "files": [ { "file": "synthetic-bitmap.bmp", "bytes": 771578, "sha256": "00bb63d145385ec1e8168a33a630e13dd19b90f082d5fcafe0341cf0c63021d6" }, { "file": "jpeg-native.jpg", "bytes": 37519, "sha256": "ffd680084fd6bc8269d15630b9d1ad18bc7a24438fce6df27babe68f178c1ea5" }, { "file": "png-native.png", "bytes": 13239, "sha256": "a0b12a1e0a80222a57b0dce21635214fe086703739ddaa74baaae7877acd7832" }, { "file": "jpeg-settings.jpg", "bytes": 82039, "sha256": "ecbd1b13f34246a3a1854b91cc89660752d499889d26fe5312d4f2a6de478c3c" }, { "file": "png-settings.jpg", "bytes": 82606, "sha256": "0e3badf56adfa3e5ca8697ba7773b0df7d484db0dcb1ca6b69c2153870c9141b" }, { "file": "product-run-receipt.json", "bytes": 1213, "sha256": "6d3c84f01ea5e3c6e9edbe951139c6a57d96b3ec4839a9f691dcb43171831a6c" } ], "inputPreparationChecksSeparate": { "file": "input-only-checks.json", "checks": 40, "passed": 40, "failed": 0, "includedInPrimaryOutputCount": false }, "input": { "width": 641, "height": 401, "positiveHeightBottomUp": true, "bpp": 24, "compression": 0, "dibHeaderBytes": 40, "pixelOffset": 54, "stride": 1924, "paddingBytesPerRow": 1, "pixelArrayBytes": 771524, "xPelsPerMeter": 0, "yPelsPerMeter": 0, "paletteEntries": 0, "file": "synthetic-bitmap.bmp", "bytes": 771578, "sha256": "00bb63d145385ec1e8168a33a630e13dd19b90f082d5fcafe0341cf0c63021d6", "decodedRGBSha256": "191b570af298a155112b83077472d67bd215cc0b660820b249a538a587628902", "hasAlpha": false, "hasEmbeddedICC": false }, "png": { "file": "png-native.png", "bytes": 13239, "sha256": "a0b12a1e0a80222a57b0dce21635214fe086703739ddaa74baaae7877acd7832", "format": "PNG", "mode": "RGBA", "width": 641, "height": 401, "decodedRGBSha256": "191b570af298a155112b83077472d67bd215cc0b660820b249a538a587628902", "completeRGBEqualsInput": true, "alpha": { "pixels": 257041, "fullyOpaquePixels": 257041, "fullyTransparentPixels": 0, "partiallyTransparentPixels": 0, "minimum": 255, "maximum": 255 }, "structure": { "ihdr": { "width": 641, "height": 401, "bitDepth": 8, "colorType": 6, "compression": 0, "filterMethod": 0, "interlace": 0 }, "chunks": [ { "type": "IHDR", "bytes": 13, "crcValid": true }, { "type": "IDAT", "bytes": 4096, "crcValid": true }, { "type": "IDAT", "bytes": 4096, "crcValid": true }, { "type": "IDAT", "bytes": 4096, "crcValid": true }, { "type": "IDAT", "bytes": 840, "crcValid": true }, { "type": "IDAT", "bytes": 6, "crcValid": true }, { "type": "IEND", "bytes": 0, "crcValid": true } ], "endsAtEOF": true, "allCrcValid": true, "embeddedICC": false, "exifChunk": false }, "pixelDifference": { "pixels": 257041, "changedPixels": 0, "changedChannels": 0, "absoluteErrorSum": 0, "meanAbsoluteErrorPerChannel": 0.0, "maxAbsoluteErrorPerChannel": 0, "comparisonMeaning": "Decoded numeric RGB difference for this input and output; not a perceptual quality score or proof of color-management equivalence" } }, "jpeg": { "file": "jpeg-native.jpg", "bytes": 37519, "sha256": "ffd680084fd6bc8269d15630b9d1ad18bc7a24438fce6df27babe68f178c1ea5", "format": "JPEG", "mode": "RGB", "width": 641, "height": 401, "decodedRGBSha256": "daff2d0682ae85fa247f3842c5ff85de404b37cd3e5697e66281f7685a6b6669", "hasAlpha": false, "structure": { "sof": { "marker": "FFC0", "precision": 8, "width": 641, "height": 401, "channels": 3 }, "segmentsBeforeScan": [ { "marker": "FFE0", "payloadBytes": 14 }, { "marker": "FFE2", "payloadBytes": 470 }, { "marker": "FFDB", "payloadBytes": 65 }, { "marker": "FFDB", "payloadBytes": 65 }, { "marker": "FFC0", "payloadBytes": 15 }, { "marker": "FFC4", "payloadBytes": 28 }, { "marker": "FFC4", "payloadBytes": 100 }, { "marker": "FFC4", "payloadBytes": 26 }, { "marker": "FFC4", "payloadBytes": 69 } ], "jfif": { "version": [ 1, 1 ], "densityUnit": 0, "densityX": 1, "densityY": 1, "meaning": "Unit0 stores aspect-ratio density values, not physical DPI" }, "hasExifAPP1": false, "icc": { "profileBytes": 456, "profileSha256": "12afb4d9953adee0607d347daee5b78b18d6b3cab2d572b88970703f5edb37bc", "chunkCount": 1, "declaredChunkCount": 1, "app2PayloadBytes": [ 470 ], "declaredProfileBytes": 456, "signature": "acsp" }, "endsWithEOI": true }, "pixelDifference": { "pixels": 257041, "changedPixels": 249253, "changedChannels": 420662, "absoluteErrorSum": 1189394, "meanAbsoluteErrorPerChannel": 1.5424180059471706, "maxAbsoluteErrorPerChannel": 92, "comparisonMeaning": "Decoded numeric RGB difference for this input and output; not a perceptual quality score or proof of color-management equivalence" }, "regionalDifferences": { "title_bitmap_letters": { "boxExclusiveEnd": [ 200, 18, 442, 66 ], "pixels": 11616, "changedPixels": 11616, "changedChannels": 25677, "absoluteErrorSum": 79892, "meanAbsoluteErrorPerChannel": 2.292584940312213, "maxAbsoluteErrorPerChannel": 25, "comparisonMeaning": "Decoded numeric RGB difference for this input and output; not a perceptual quality score or proof of color-management equivalence" }, "fine_lines_and_small_text": { "boxExclusiveEnd": [ 99, 280, 542, 351 ], "pixels": 31453, "changedPixels": 31453, "changedChannels": 69067, "absoluteErrorSum": 335018, "meanAbsoluteErrorPerChannel": 3.55046153520067, "maxAbsoluteErrorPerChannel": 92, "comparisonMeaning": "Decoded numeric RGB difference for this input and output; not a perceptual quality score or proof of color-management equivalence" }, "gradient": { "boxExclusiveEnd": [ 96, 164, 545, 271 ], "pixels": 48043, "changedPixels": 42365, "changedChannels": 78250, "absoluteErrorSum": 153622, "meanAbsoluteErrorPerChannel": 1.065864607400315, "maxAbsoluteErrorPerChannel": 68, "comparisonMeaning": "Decoded numeric RGB difference for this input and output; not a perceptual quality score or proof of color-management equivalence" }, "bottom_bitmap_letters": { "boxExclusiveEnd": [ 224, 357, 417, 394 ], "pixels": 7141, "changedPixels": 7141, "changedChannels": 16011, "absoluteErrorSum": 51031, "meanAbsoluteErrorPerChannel": 2.3820660038276618, "maxAbsoluteErrorPerChannel": 24, "comparisonMeaning": "Decoded numeric RGB difference for this input and output; not a perceptual quality score or proof of color-management equivalence" } }, "differenceIsExpectedObservationNotFailure": true }, "corners": { "A": { "xy": [ 20, 20 ], "inputRGB": [ 214, 63, 69 ], "pngRGB": [ 214, 63, 69 ], "jpegRGB": [ 214, 63, 70 ], "jpegNearestOriginalCornerPalette": "A", "jpegAbsoluteDifference": [ 0, 0, 1 ] }, "B": { "xy": [ 570, 20 ], "inputRGB": [ 35, 122, 67 ], "pngRGB": [ 35, 122, 67 ], "jpegRGB": [ 37, 121, 69 ], "jpegNearestOriginalCornerPalette": "B", "jpegAbsoluteDifference": [ 2, 1, 2 ] }, "C": { "xy": [ 20, 330 ], "inputRGB": [ 36, 93, 202 ], "pngRGB": [ 36, 93, 202 ], "jpegRGB": [ 38, 92, 201 ], "jpegNearestOriginalCornerPalette": "C", "jpegAbsoluteDifference": [ 2, 1, 1 ] }, "D": { "xy": [ 570, 330 ], "inputRGB": [ 131, 62, 178 ], "pngRGB": [ 131, 62, 178 ], "jpegRGB": [ 130, 65, 169 ], "jpegNearestOriginalCornerPalette": "D", "jpegAbsoluteDifference": [ 1, 3, 9 ] } }, "visualReadback": { "method": "Local raw JPEG and PNG inspected with image viewer; no reconstructed output substituted", "observed": [ "A red and B green above C blue and D purple; upward arrow remains upward", "Title and bottom bitmap lettering remain readable in these displayed files", "JPEG gradient, tiny letters and fine-line edges differ numerically from input; PNG RGB is identical for every pixel" ], "screenshots": { "jpeg-settings.jpg": "Actual pre-run settings with JPEG selected and keepEXIF checked; not a successful-output screenshot", "png-settings.jpg": "Actual pre-run settings with PNG selected and keepEXIF checked; not a successful-output screenshot" } }, "actualOperations": { "fixtureUploads": 1, "inputFiles": 1, "inputFile": "synthetic-bitmap.bmp", "fileInputAccept": "image/*", "conversionRuns": 2, "outputFormats": [ "JPEG", "PNG" ], "singleImageDownloads": 2, "nativeZipDownloads": 0, "keepExif": true, "originalOutputFormatRestoredJpegWithoutThirdRun": true, "ownToolTabClosedAfterReceipt": true }, "researchEvidenceSeparate": { "visible": "keyword-research-visible.json", "export": "keyword-research-export.csv", "review": "keyword-research-review.json", "seed": "bmp转jpg", "duration": "3M", "dateBounds": [ "2026-07-17", "2026-10-14" ], "scope": "All countries/languages/devices", "seedMarketImpressions": 938, "forwardEnglishRelatedKeyword": "bmp to jpg", "forwardEnglishRelatedMarketImpressions": 2219, "exportRows": 10, "meaning": "Bing market observations over the selected period, not monthly volume, site traffic, live rank or SEO outcome", "unsupportedInverseQueries": [ "jpg转bmp", "png转bmp" ], "historicalTimingNote": "Research review was recorded before this product run; its not-yet-tested wording is preserved as time-specific evidence" }, "limits": [ "Only this self-authored 641x401, 24-bit BI_RGB bottom-up BMP and these two actual downloads were tested", "PNG RGBA has alpha 255 everywhere because the input is wholly opaque; this is not automatic background removal", "JPEG numeric changes are observed re-encoding differences, not failure of an exact-match promise", "No inference about arbitrary BMP, 32-bit alpha, indexed palette, RLE, bitfields, top-down files, batch, browser variation or physical DPI", "Keep EXIF true on an input with no EXIF does not prove metadata-preservation capability", "Output sizes describe only these files; no universal compression or color-equivalence guarantee", "JPEG output contains a 456-byte embedded ICC profile in a 470-byte APP2 payload and JFIF unit 0 ratio 1x1; unit 0 is not a physical DPI setting", "Native ZIP downloads 0; any future proof ZIP is locally assembled" ], "pathScan": { "findings": [], "passed": true, "scope": "All string values in this report before adding numeric verification results" }, "primaryVerification": { "checks": 56, "passed": 56, "failed": 0, "includesIndependentOutputChecks": false, "includesInputPreparationChecks": false }, "results": [ { "name": "fixture_hash_bound_to_prepared_input", "passed": true, "actual": "00bb63d145385ec1e8168a33a630e13dd19b90f082d5fcafe0341cf0c63021d6", "expected": "00bb63d145385ec1e8168a33a630e13dd19b90f082d5fcafe0341cf0c63021d6" }, { "name": "BMP_manual_RGB_decode_bound_to_input", "passed": true, "actual": "191b570af298a155112b83077472d67bd215cc0b660820b249a538a587628902", "expected": "191b570af298a155112b83077472d67bd215cc0b660820b249a538a587628902" }, { "name": "BMP_input_dimensions", "passed": true, "actual": [ 641, 401 ], "expected": [ 641, 401 ] }, { "name": "BMP_input_stride", "passed": true, "actual": 1924, "expected": 1924 }, { "name": "JPEG_magic", "passed": true, "actual": "ffd8", "expected": "ffd8" }, { "name": "PNG_magic", "passed": true, "actual": "89504e470d0a1a0a", "expected": "89504e470d0a1a0a" }, { "name": "JPEG_actual_file_bytes", "passed": true, "actual": 37519, "expected": 37519 }, { "name": "PNG_actual_file_bytes", "passed": true, "actual": 13239, "expected": 13239 }, { "name": "JPEG_Pillow_format", "passed": true, "actual": "JPEG", "expected": "JPEG" }, { "name": "PNG_Pillow_format", "passed": true, "actual": "PNG", "expected": "PNG" }, { "name": "JPEG_Pillow_mode", "passed": true, "actual": "RGB", "expected": "RGB" }, { "name": "PNG_Pillow_mode", "passed": true, "actual": "RGBA", "expected": "RGBA" }, { "name": "JPEG_Pillow_dimensions", "passed": true, "actual": [ 641, 401 ], "expected": [ 641, 401 ] }, { "name": "PNG_Pillow_dimensions", "passed": true, "actual": [ 641, 401 ], "expected": [ 641, 401 ] }, { "name": "JPEG_SOF_dimensions", "passed": true, "actual": [ 641, 401 ], "expected": [ 641, 401 ] }, { "name": "JPEG_SOF_precision_channels", "passed": true, "actual": [ 8, 3 ], "expected": [ 8, 3 ] }, { "name": "JPEG_ends_with_EOI", "passed": true, "actual": true, "expected": true }, { "name": "PNG_IHDR_dimensions", "passed": true, "actual": [ 641, 401 ], "expected": [ 641, 401 ] }, { "name": "PNG_IHDR_bit_depth_color_type", "passed": true, "actual": [ 8, 6 ], "expected": [ 8, 6 ] }, { "name": "PNG_IHDR_compression_filter_interlace", "passed": true, "actual": [ 0, 0, 0 ], "expected": [ 0, 0, 0 ] }, { "name": "PNG_all_chunk_CRC_valid", "passed": true, "actual": true, "expected": true }, { "name": "PNG_ends_at_IEND_EOF", "passed": true, "actual": true, "expected": true }, { "name": "PNG_complete_RGB_byte_count", "passed": true, "actual": 771123, "expected": 771123 }, { "name": "PNG_complete_RGB_equals_decoded_BMP", "passed": true, "actual": true, "expected": true }, { "name": "PNG_alpha_plane_pixels", "passed": true, "actual": 257041, "expected": 257041 }, { "name": "PNG_all_alpha_255", "passed": true, "actual": true, "expected": true }, { "name": "PNG_no_embedded_ICC_chunk", "passed": true, "actual": false, "expected": false }, { "name": "PNG_no_eXIf_chunk", "passed": true, "actual": false, "expected": false }, { "name": "JPEG_JFIF_unit_unspecified_physical_density", "passed": true, "actual": 0, "expected": 0 }, { "name": "JPEG_JFIF_ratio", "passed": true, "actual": [ 1, 1 ], "expected": [ 1, 1 ] }, { "name": "JPEG_ICC_profile_bytes", "passed": true, "actual": 456, "expected": 456 }, { "name": "JPEG_ICC_APP2_payload_bytes", "passed": true, "actual": [ 470 ], "expected": [ 470 ] }, { "name": "JPEG_ICC_chunk_counts", "passed": true, "actual": [ 1, 1 ], "expected": [ 1, 1 ] }, { "name": "JPEG_ICC_declared_length_matches_bytes", "passed": true, "actual": 456, "expected": 456 }, { "name": "JPEG_ICC_signature", "passed": true, "actual": "acsp", "expected": "acsp" }, { "name": "JPEG_ICC_Pillow_matches_segment_parser", "passed": true, "actual": 456, "expected": 456 }, { "name": "JPEG_no_EXIF_APP1_in_this_output", "passed": true, "actual": false, "expected": false }, { "name": "PNG_corner_A_exact", "passed": true, "actual": [ 214, 63, 69 ], "expected": [ 214, 63, 69 ] }, { "name": "JPEG_corner_A_nearest_original_palette", "passed": true, "actual": "A", "expected": "A" }, { "name": "PNG_corner_B_exact", "passed": true, "actual": [ 35, 122, 67 ], "expected": [ 35, 122, 67 ] }, { "name": "JPEG_corner_B_nearest_original_palette", "passed": true, "actual": "B", "expected": "B" }, { "name": "PNG_corner_C_exact", "passed": true, "actual": [ 36, 93, 202 ], "expected": [ 36, 93, 202 ] }, { "name": "JPEG_corner_C_nearest_original_palette", "passed": true, "actual": "C", "expected": "C" }, { "name": "PNG_corner_D_exact", "passed": true, "actual": [ 131, 62, 178 ], "expected": [ 131, 62, 178 ] }, { "name": "JPEG_corner_D_nearest_original_palette", "passed": true, "actual": "D", "expected": "D" }, { "name": "PNG_up_arrow_sample_exact", "passed": true, "actual": [ 25, 39, 59 ], "expected": [ 25, 39, 59 ] }, { "name": "receipt_fixture_name", "passed": true, "actual": "synthetic-bitmap.bmp", "expected": "synthetic-bitmap.bmp" }, { "name": "receipt_one_upload", "passed": true, "actual": 1, "expected": 1 }, { "name": "receipt_two_conversion_runs", "passed": true, "actual": 2, "expected": 2 }, { "name": "receipt_output_formats", "passed": true, "actual": [ "JPEG", "PNG" ], "expected": [ "JPEG", "PNG" ] }, { "name": "receipt_two_single_downloads", "passed": true, "actual": 2, "expected": 2 }, { "name": "receipt_no_native_ZIP", "passed": true, "actual": 0, "expected": 0 }, { "name": "receipt_keep_EXIF_enabled", "passed": true, "actual": true, "expected": true }, { "name": "receipt_restored_JPEG_without_third_run", "passed": true, "actual": true, "expected": true }, { "name": "receipt_created_tab_closed", "passed": true, "actual": true, "expected": true }, { "name": "report_has_no_local_absolute_paths", "passed": true, "actual": [], "expected": [] } ] }, "independentObservation": { "schema": "independent-bmp-native-output-checks-v1", "method": "Raw BMP and PNG parsed with Python standard library; Pillow only decodes JPEG. No main output report or main checker was read.", "files": { "input": { "basename": "synthetic-bitmap.bmp", "bytes": 771578, "sha256": "00bb63d145385ec1e8168a33a630e13dd19b90f082d5fcafe0341cf0c63021d6" }, "jpeg": { "basename": "jpeg-native.jpg", "bytes": 37519, "sha256": "ffd680084fd6bc8269d15630b9d1ad18bc7a24438fce6df27babe68f178c1ea5" }, "png": { "basename": "png-native.png", "bytes": 13239, "sha256": "a0b12a1e0a80222a57b0dce21635214fe086703739ddaa74baaae7877acd7832" } }, "verifier": { "basename": "verify_bmp_outputs_independent.py", "sha256": "d91ac99efdb922390000bef5aabe997c6e4fa6a047d95b1566776176fef43763" }, "input_parser_validation": { "total": 30, "passed": 30, "failed": 0, "checks": [ { "id": "bmp_signature", "passed": true }, { "id": "bmp_file_size_declared_equals_actual", "passed": true, "observed": 771578 }, { "id": "bmp_reserved1_zero", "passed": true }, { "id": "bmp_reserved2_zero", "passed": true }, { "id": "bmp_bitmapinfoheader_40", "passed": true, "observed": 40 }, { "id": "bmp_pixel_offset_54", "passed": true, "observed": 54 }, { "id": "bmp_no_gap_after_dib", "passed": true }, { "id": "bmp_width_641", "passed": true, "observed": 641 }, { "id": "bmp_height_401", "passed": true, "observed": 401 }, { "id": "bmp_positive_height_bottom_up", "passed": true }, { "id": "bmp_one_plane", "passed": true }, { "id": "bmp_24_bits", "passed": true }, { "id": "bmp_bi_rgb", "passed": true }, { "id": "bmp_no_alpha_channel_in_24bit_layout", "passed": true }, { "id": "bmp_no_palette_declared", "passed": true }, { "id": "bmp_no_important_palette_entries", "passed": true }, { "id": "bmp_no_palette_bytes", "passed": true }, { "id": "bmp_x_pixels_per_meter_zero", "passed": true }, { "id": "bmp_y_pixels_per_meter_zero", "passed": true }, { "id": "bmp_row_rgb_bytes_1923", "passed": true, "observed": 1923 }, { "id": "bmp_row_stride_1924", "passed": true, "observed": 1924 }, { "id": "bmp_one_padding_byte", "passed": true, "observed": 1 }, { "id": "bmp_declared_image_size_exact", "passed": true, "observed": 771524 }, { "id": "bmp_pixel_array_inside_file", "passed": true }, { "id": "bmp_no_trailing_bytes", "passed": true }, { "id": "bmp_all_row_padding_zero", "passed": true, "observed": 401 }, { "id": "bmp_decoded_rgb_length", "passed": true, "observed": 771123 }, { "id": "bmp_bottom_row_stored_first", "passed": true }, { "id": "bmp_top_row_stored_last", "passed": true }, { "id": "bmp_no_profile_block_in_this_layout", "passed": true } ] }, "independent_output_validation": { "total": 59, "passed": 59, "failed": 0, "checks": [ { "id": "png_signature", "passed": true }, { "id": "png_chunk_1_IHDR_crc", "passed": true }, { "id": "png_chunk_2_IDAT_crc", "passed": true }, { "id": "png_chunk_3_IDAT_crc", "passed": true }, { "id": "png_chunk_4_IDAT_crc", "passed": true }, { "id": "png_chunk_5_IDAT_crc", "passed": true }, { "id": "png_chunk_6_IDAT_crc", "passed": true }, { "id": "png_chunk_7_IEND_crc", "passed": true }, { "id": "png_all_chunks_inside_file", "passed": true }, { "id": "png_no_trailing_bytes", "passed": true }, { "id": "png_one_ihdr_first", "passed": true }, { "id": "png_one_iend_last", "passed": true }, { "id": "png_iend_empty", "passed": true }, { "id": "png_has_idat", "passed": true }, { "id": "png_only_supported_critical_chunks", "passed": true }, { "id": "png_idat_consecutive", "passed": true }, { "id": "png_ihdr_length_13", "passed": true }, { "id": "png_dimensions_equal_bmp", "passed": true, "observed": [ 641, 401 ] }, { "id": "png_bit_depth_8", "passed": true, "observed": 8 }, { "id": "png_true_color_with_alpha_type6", "passed": true, "observed": 6 }, { "id": "png_standard_compression", "passed": true }, { "id": "png_standard_filter_method", "passed": true }, { "id": "png_not_interlaced", "passed": true }, { "id": "png_zlib_stream_finished", "passed": true }, { "id": "png_zlib_no_unused_trailer", "passed": true }, { "id": "png_zlib_no_unconsumed_tail", "passed": true }, { "id": "png_inflated_size_exact", "passed": true, "observed": 1028565 }, { "id": "png_all_rows_decoded", "passed": true, "observed": { "2": 401 } }, { "id": "png_rgba_size_exact", "passed": true, "observed": 1028164 }, { "id": "png_rgb_length_equal_bmp", "passed": true }, { "id": "png_rgb_exact_every_pixel", "passed": true, "observed": { "mismatching_pixels": 0, "mismatching_channels": 0 } }, { "id": "png_alpha_all_255", "passed": true, "observed": { "minimum": 255, "maximum": 255 } }, { "id": "png_zero_transparent_or_translucent_pixels", "passed": true }, { "id": "jpeg_soi", "passed": true }, { "id": "jpeg_eoi_at_end", "passed": true }, { "id": "jpeg_segment_and_entropy_structure_complete", "passed": true }, { "id": "jpeg_one_sof", "passed": true, "observed": 1 }, { "id": "jpeg_baseline_sof0", "passed": true }, { "id": "jpeg_sof_dimensions_equal_bmp", "passed": true, "observed": [ 641, 401 ] }, { "id": "jpeg_precision_8", "passed": true }, { "id": "jpeg_three_components", "passed": true }, { "id": "jpeg_sof_payload_length", "passed": true }, { "id": "jpeg_single_jfif", "passed": true }, { "id": "jpeg_jfif_unit_zero_no_dpi_unit", "passed": true, "observed": 0 }, { "id": "jpeg_jfif_density_1_1", "passed": true, "observed": [ 1, 1 ] }, { "id": "jpeg_single_icc_app2", "passed": true }, { "id": "jpeg_icc_sequence_complete", "passed": true, "observed": [ [ 1, 1 ] ] }, { "id": "jpeg_icc_app2_payload_470", "passed": true, "observed": [ 470 ] }, { "id": "jpeg_icc_profile_456", "passed": true, "observed": 456 }, { "id": "jpeg_icc_declared_length_exact", "passed": true }, { "id": "jpeg_icc_profile_signature", "passed": true }, { "id": "jpeg_no_exif_app1", "passed": true }, { "id": "jpeg_pillow_format", "passed": true }, { "id": "jpeg_pillow_dimensions_match_sof", "passed": true }, { "id": "jpeg_decoded_rgb_length_equal_bmp", "passed": true }, { "id": "jpeg_top_left_color_remains_at_position", "passed": true, "observed": { "nearest_source_corner": "top_left" } }, { "id": "jpeg_top_right_color_remains_at_position", "passed": true, "observed": { "nearest_source_corner": "top_right" } }, { "id": "jpeg_bottom_left_color_remains_at_position", "passed": true, "observed": { "nearest_source_corner": "bottom_left" } }, { "id": "jpeg_bottom_right_color_remains_at_position", "passed": true, "observed": { "nearest_source_corner": "bottom_right" } } ] }, "upstream_input40": { "included_in_output_count": false, "note": "The upstream 40-check input validation is separate and was not read or merged into these generated independent counts." }, "bmp": { "width": 641, "signed_height": 401, "storage": "bottom-up BGR", "bits_per_pixel": 24, "compression": "BI_RGB (0)", "dib_header_bytes": 40, "pixel_offset": 54, "stride_bytes": 1924, "padding_bytes_per_row": 1, "decoded_rgb_bytes": 771123, "decoded_rgb_sha256": "191b570af298a155112b83077472d67bd215cc0b660820b249a538a587628902", "alpha_channel": false, "pixels_per_meter": [ 0, 0 ] }, "png": { "width": 641, "height": 401, "bit_depth": 8, "color_type": 6, "color_type_name": "RGBA (truecolor with alpha)", "interlace": 0, "chunks": [ { "type": "IHDR", "length": 13, "crc_valid": true }, { "type": "IDAT", "length": 4096, "crc_valid": true }, { "type": "IDAT", "length": 4096, "crc_valid": true }, { "type": "IDAT", "length": 4096, "crc_valid": true }, { "type": "IDAT", "length": 840, "crc_valid": true }, { "type": "IDAT", "length": 6, "crc_valid": true }, { "type": "IEND", "length": 0, "crc_valid": true } ], "filter_row_counts": { "2": 401 }, "inflated_bytes": 1028565, "decoded_rgb_sha256": "191b570af298a155112b83077472d67bd215cc0b660820b249a538a587628902", "mismatching_rgb_pixels": 0, "mismatching_rgb_channels": 0, "png_rgb_exact_bmp": true, "alpha": { "minimum": 255, "maximum": 255, "opaque_pixels": 257041, "nonopaque_pixels": 0 }, "interpretation": "This PNG has an alpha channel but all pixels are opaque; conversion did not remove the background." }, "jpeg": { "width": 641, "height": 401, "sof_marker": "0xc0", "sample_precision": 8, "components": 3, "scan_count": 1, "restart_marker_count": 0, "segments": [ { "marker": "0xe0", "payload_bytes": 14 }, { "marker": "0xe2", "payload_bytes": 470 }, { "marker": "0xdb", "payload_bytes": 65 }, { "marker": "0xdb", "payload_bytes": 65 }, { "marker": "0xc0", "payload_bytes": 15 }, { "marker": "0xc4", "payload_bytes": 28 }, { "marker": "0xc4", "payload_bytes": 100 }, { "marker": "0xc4", "payload_bytes": 26 }, { "marker": "0xc4", "payload_bytes": 69 }, { "marker": "0xda", "payload_bytes": 10 } ], "jfif": { "version": [ 1, 1 ], "unit": 0, "density": [ 1, 1 ], "interpretation": "Unit 0 is an aspect-ratio density; this does not establish preserved DPI." }, "icc": { "app2_payload_bytes": [ 470 ], "profile_bytes": 456, "profile_sha256": "12afb4d9953adee0607d347daee5b78b18d6b3cab2d572b88970703f5edb37bc", "sequence": [ [ 1, 1 ] ] }, "decoded_rgb_sha256": "daff2d0682ae85fa247f3842c5ff85de404b37cd3e5697e66281f7685a6b6669", "mismatching_rgb_pixels": 249253, "mismatching_rgb_channels": 420662, "rgb_mean_absolute_error": 1.5424180059471706, "rgb_max_absolute_channel_error": 92, "rgb_exact_bmp": false, "corner_observations": { "top_left": { "xy": [ 30, 30 ], "bmp_rgb": [ 214, 63, 69 ], "jpeg_rgb": [ 214, 63, 70 ], "absolute_channel_deltas": [ 0, 0, 1 ], "nearest_source_corner": "top_left" }, "top_right": { "xy": [ 610, 30 ], "bmp_rgb": [ 35, 122, 67 ], "jpeg_rgb": [ 35, 122, 67 ], "absolute_channel_deltas": [ 0, 0, 0 ], "nearest_source_corner": "top_right" }, "bottom_left": { "xy": [ 30, 370 ], "bmp_rgb": [ 36, 93, 202 ], "jpeg_rgb": [ 36, 92, 201 ], "absolute_channel_deltas": [ 0, 1, 1 ], "nearest_source_corner": "bottom_left" }, "bottom_right": { "xy": [ 610, 370 ], "bmp_rgb": [ 131, 62, 178 ], "jpeg_rgb": [ 131, 62, 178 ], "absolute_channel_deltas": [ 0, 0, 0 ], "nearest_source_corner": "bottom_right" } }, "interpretation": "JPEG differences are observed lossy-encoding results, not a failed check and not a lossless claim." }, "size_comparison": { "jpeg": { "bytes": 37519, "ratio_to_bmp": 0.048626321642141174, "bytes_less_than_bmp": 734059 }, "png": { "bytes": 13239, "ratio_to_bmp": 0.017158343032071935, "bytes_less_than_bmp": 758339 } }, "scope": "One self-authored 641x401, 24-bit BI_RGB bottom-up BMP and the two supplied native output files only. No claims about indexed/RLE/bitfields/32-bit BMP, alpha inputs, batch conversion, or DPI preservation.", "passed": true, "path_scan": { "absolute_path_count": 0, "passed": true, "evidence_names": "basenames only" } }, "nativeResultVerification": { "stage": "actual_native_BMP_to_JPEG_and_PNG_analysis", "checkedAt": "2026-10-17 Asia/Shanghai", "nativeRawBytesUnmodified": true, "files": [ { "file": "synthetic-bitmap.bmp", "bytes": 771578, "sha256": "00bb63d145385ec1e8168a33a630e13dd19b90f082d5fcafe0341cf0c63021d6" }, { "file": "jpeg-native.jpg", "bytes": 37519, "sha256": "ffd680084fd6bc8269d15630b9d1ad18bc7a24438fce6df27babe68f178c1ea5" }, { "file": "png-native.png", "bytes": 13239, "sha256": "a0b12a1e0a80222a57b0dce21635214fe086703739ddaa74baaae7877acd7832" }, { "file": "jpeg-settings.jpg", "bytes": 82039, "sha256": "ecbd1b13f34246a3a1854b91cc89660752d499889d26fe5312d4f2a6de478c3c" }, { "file": "png-settings.jpg", "bytes": 82606, "sha256": "0e3badf56adfa3e5ca8697ba7773b0df7d484db0dcb1ca6b69c2153870c9141b" }, { "file": "product-run-receipt.json", "bytes": 1213, "sha256": "6d3c84f01ea5e3c6e9edbe951139c6a57d96b3ec4839a9f691dcb43171831a6c" } ], "reportBindings": [ { "role": "primary_output_readback", "file": "output-checks.json", "bytes": 21341, "sha256": "b1af4bb27f651e6cef76268fa34b09d73c571978247bf8030adab8bddb767db4" }, { "role": "independent_output_readback", "file": "independent-output-checks.json", "bytes": 15603, "sha256": "8a25790ea183f296be52cddb9b8d0e39f0f80bc6ef9744648dc6c5460dcd1d04" }, { "role": "input_preparation_only", "file": "input-only-checks.json", "bytes": 6350, "sha256": "961cf5ef3d434638c28a138a08c1fae6d1f5351d86204a360fe0130b0c95f14b" }, { "role": "product_operations_receipt", "file": "product-run-receipt.json", "bytes": 1213, "sha256": "6d3c84f01ea5e3c6e9edbe951139c6a57d96b3ec4839a9f691dcb43171831a6c" }, { "role": "independent_checker", "file": "verify_bmp_outputs_independent.py", "bytes": 21643, "sha256": "d91ac99efdb922390000bef5aabe997c6e4fa6a047d95b1566776176fef43763" }, { "role": "primary_analyzer", "file": "analyze_bmp_outputs.py", "bytes": 18116, "sha256": "cdfc0b4a08210a49cc82a28ef983c43186bb6f2ccf1540e9e5fefbc3508866f5" } ], "inputPreparationVerification": { "checks": 40, "passed": 40, "failed": 0 }, "primaryOutputVerification": { "checks": 56, "passed": 56, "failed": 0, "includesIndependentOutputChecks": false, "includesInputPreparationChecks": false }, "independentOutputVerification": { "total": 59, "passed": 59, "failed": 0 }, "independentBMPParserVerification": { "total": 30, "passed": 30, "failed": 0 }, "verificationCountsKeptSeparate": true, "png": { "file": "png-native.png", "bytes": 13239, "sha256": "a0b12a1e0a80222a57b0dce21635214fe086703739ddaa74baaae7877acd7832", "width": 641, "height": 401, "mode": "RGBA", "completeRGBEqualsInput": true, "alpha": { "pixels": 257041, "fullyOpaquePixels": 257041, "fullyTransparentPixels": 0, "partiallyTransparentPixels": 0, "minimum": 255, "maximum": 255 } }, "jpeg": { "file": "jpeg-native.jpg", "bytes": 37519, "sha256": "ffd680084fd6bc8269d15630b9d1ad18bc7a24438fce6df27babe68f178c1ea5", "width": 641, "height": 401, "mode": "RGB", "pixelDifference": { "pixels": 257041, "changedPixels": 249253, "changedChannels": 420662, "absoluteErrorSum": 1189394, "meanAbsoluteErrorPerChannel": 1.5424180059471706, "maxAbsoluteErrorPerChannel": 92, "comparisonMeaning": "Decoded numeric RGB difference for this input and output; not a perceptual quality score or proof of color-management equivalence" } }, "jpegMetadata": { "ICCProfileBytes": 456, "APP2PayloadBytes": 470, "JFIFDensityUnit": 0, "JFIFDensityRatio": [ 1, 1 ], "physicalDPIClaim": false, "inputHadICC": false, "description": "JPEG output contains ICC; it was not preserved from this profile-free BMP" }, "actualOperations": { "fixtureUploads": 1, "inputFiles": 1, "inputFile": "synthetic-bitmap.bmp", "fileInputAccept": "image/*", "conversionRuns": 2, "outputFormats": [ "JPEG", "PNG" ], "singleImageDownloads": 2, "nativeZipDownloads": 0, "keepExif": true, "originalOutputFormatRestoredJpegWithoutThirdRun": true, "ownToolTabClosedAfterReceipt": true }, "screenshotsArePreRunSettings": true, "limits": [ "Only this self-authored 641x401, 24-bit BI_RGB bottom-up BMP and these two actual downloads were tested", "PNG RGBA has alpha 255 everywhere because the input is wholly opaque; this is not automatic background removal", "JPEG numeric changes are observed re-encoding differences, not failure of an exact-match promise", "No inference about arbitrary BMP, 32-bit alpha, indexed palette, RLE, bitfields, top-down files, batch, browser variation or physical DPI", "Keep EXIF true on an input with no EXIF does not prove metadata-preservation capability", "Output sizes describe only these files; no universal compression or color-equivalence guarantee", "JPEG output contains a 456-byte embedded ICC profile in a 470-byte APP2 payload and JFIF unit 0 ratio 1x1; unit 0 is not a physical DPI setting", "Native ZIP downloads 0; any future proof ZIP is locally assembled" ], "allPassed": true, "pathScan": { "absoluteLocalPathCount": 0, "passed": true, "evidenceNames": "basenames only" } }, "actualOperations": { "fixtureUploads": 1, "inputFiles": 1, "inputFile": "synthetic-bitmap.bmp", "fileInputAccept": "image/*", "conversionRuns": 2, "outputFormats": [ "JPEG", "PNG" ], "singleImageDownloads": 2, "nativeZipDownloads": 0, "keepExif": true, "initialSettings": "图片格式转换工具\n\n支持多种图片格式转换，批量处理\n\n开始转换\n文件列表 (1)\nsynthetic-bitmap.bmp\n原始大小: 753.49 KB\n\n点击或拖拽添加更多图片文件\n\n最多支持20个文件\n\n转换设置\n输出格式\nJPEG\n元数据\n保留 EXIF 信息\n操作\n下载全部\n清空队列\nHEIC 转换提示\n\n目前暂不支持直接在浏览器中将 HEIC 格式转换为 JPG。 建议您在本地操作系统（如 macOS 或 iOS）中先行转换，或使用其他桌面工具进行转换。", "downloadButtonsClickedOncePerOutput": true, "downloadEventsObserved": false, "uniqueFreshOwnDownloadsVerified": true, "originalOutputFormatRestoredJpegWithoutThirdRun": true, "ownToolTabClosedAfterReceipt": true, "limits": "One self-authored24bit BI_RGB bottom-up BMP only; no32bit alpha, indexed palette, RLE, bitfields, multi-browser, arbitrary BMP or batch ZIP validation." }, "screenshotsArePreRunSettings": true, "marketEvidence": { "checkedAt": "2026-10-17 Asia/Shanghai", "seed": "bmp转jpg", "selectedDuration": "3M", "dateBounds": [ "2026-07-17", "2026-10-14" ], "scope": "All countries/languages/devices", "seedMarketImpressionsDisplayed": "938", "exportRows": 10, "exportSha256": "d4e19aed1968f54cc16a18a4732c149dbf01ce024a0ae73e83e467a9560af9d3", "matchingForwardRows": [ { "Keyword": "bmp to jpg", "Trends": "[216,183,169,177,150,175,173,196,223,199,162,196]", "Impressions": "2219" } ], "unsupportedReverseRows": [ { "Keyword": "jpg转bmp", "Trends": "[83,71,79,74,73,65,93,89,69,59,53,59]", "Impressions": "867" }, { "Keyword": "png转bmp", "Trends": "[171,200,154,148,135,145,128,172,159,113,124,104]", "Impressions": "1753" } ], "limits": [ "Market impressions are not monthly search volume, live rank or site traffic.", "JPG/PNG to BMP are inverse tasks and not assigned to the verified BMP-input workflow.", "The earlier research-stage support flag is not current state; actual result receipt is separately recorded." ] }, "sourceHashes": [ { "file": "synthetic-bitmap.bmp", "bytes": 771578, "sha256": "00bb63d145385ec1e8168a33a630e13dd19b90f082d5fcafe0341cf0c63021d6" }, { "file": "jpeg-native.jpg", "bytes": 37519, "sha256": "ffd680084fd6bc8269d15630b9d1ad18bc7a24438fce6df27babe68f178c1ea5" }, { "file": "png-native.png", "bytes": 13239, "sha256": "a0b12a1e0a80222a57b0dce21635214fe086703739ddaa74baaae7877acd7832" }, { "file": "jpeg-settings.jpg", "bytes": 82039, "sha256": "ecbd1b13f34246a3a1854b91cc89660752d499889d26fe5312d4f2a6de478c3c" }, { "file": "png-settings.jpg", "bytes": 82606, "sha256": "0e3badf56adfa3e5ca8697ba7773b0df7d484db0dcb1ca6b69c2153870c9141b" } ], "sourceReportHashes": [ { "file": "fixture-manifest.json", "sha256": "6e745aed13f937c798ad401cb431d5a04d03d501d8f9c338247b26380a1ac532" }, { "file": "input-only-checks.json", "sha256": "961cf5ef3d434638c28a138a08c1fae6d1f5351d86204a360fe0130b0c95f14b" }, { "file": "output-checks.json", "sha256": "b1af4bb27f651e6cef76268fa34b09d73c571978247bf8030adab8bddb767db4" }, { "file": "independent-output-checks.json", "sha256": "8a25790ea183f296be52cddb9b8d0e39f0f80bc6ef9744648dc6c5460dcd1d04" }, { "file": "native-result-verification.json", "sha256": "5f26a28314552ac9f6b40b6d308e9447e45de2d2b6493e913ffc40f8826a854c" }, { "file": "product-run-receipt.json", "sha256": "6d3c84f01ea5e3c6e9edbe951139c6a57d96b3ec4839a9f691dcb43171831a6c" }, { "file": "keyword-research-review.json", "sha256": "1597a9b146e03f8ce086e7fb750b06993032b249364cb06e1f170c3637dce4cf" }, { "file": "keyword-research-export.csv", "sha256": "d4e19aed1968f54cc16a18a4732c149dbf01ce024a0ae73e83e467a9560af9d3" } ], "newBrowserOrProductRunsForPackaging": 0, "comparisonScope": "Local decoding of actual BMP and the two native outputs only. No pre-run screenshot or input preview is presented as a completed product result.", "limits": [ "Only this self-authored 641x401, 24-bit BI_RGB bottom-up BMP and these two actual downloads were tested", "PNG RGBA has alpha 255 everywhere because the input is wholly opaque; this is not automatic background removal", "JPEG numeric changes are observed re-encoding differences, not failure of an exact-match promise", "No inference about arbitrary BMP, 32-bit alpha, indexed palette, RLE, bitfields, top-down files, batch, browser variation or physical DPI", "Keep EXIF true on an input with no EXIF does not prove metadata-preservation capability", "Output sizes describe only these files; no universal compression or color-equivalence guarantee", "JPEG output contains a 456-byte embedded ICC profile in a 470-byte APP2 payload and JFIF unit 0 ratio 1x1; unit 0 is not a physical DPI setting", "Native ZIP downloads 0; any future proof ZIP is locally assembled" ] }