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], "actualJpegRgb": [ 144, 185, 231 ] }, { "xy": [ 244, 340 ], "sourceDecodedRgba": [ 217, 67, 130, 24 ], "sourceWhiteRgb": [ 251, 237, 243 ], "actualPngRgba": [ 223, 74, 138, 24 ], "actualJpegRgb": [ 253, 238, 245 ] }, { "xy": [ 260, 340 ], "sourceDecodedRgba": [ 217, 67, 130, 152 ], "sourceWhiteRgb": [ 232, 143, 180 ], "actualPngRgba": [ 216, 67, 131, 152 ], "actualJpegRgb": [ 233, 143, 181 ] }, { "xy": [ 400, 340 ], "sourceDecodedRgba": [ 217, 67, 130, 255 ], "sourceWhiteRgb": [ 217, 67, 130 ], "actualPngRgba": [ 217, 67, 130, 255 ], "actualJpegRgb": [ 217, 67, 130 ] }, { "xy": [ 590, 340 ], "sourceDecodedRgba": [ 217, 67, 130, 64 ], "sourceWhiteRgb": [ 245, 208, 224 ], "actualPngRgba": [ 219, 68, 131, 64 ], "actualJpegRgb": [ 246, 207, 225 ] }, { "xy": [ 80, 118 ], "sourceDecodedRgba": [ 225, 58, 73, 255 ], "sourceWhiteRgb": [ 225, 58, 73 ], "actualPngRgba": [ 225, 58, 73, 255 ], "actualJpegRgb": [ 225, 59, 73 ] }, { "xy": [ 220, 118 ], "sourceDecodedRgba": [ 38, 104, 217, 255 ], "sourceWhiteRgb": [ 38, 104, 217 ], "actualPngRgba": [ 38, 104, 217, 255 ], "actualJpegRgb": [ 38, 104, 217 ] }, { "xy": [ 350, 118 ], "sourceDecodedRgba": [ 29, 151, 102, 255 ], "sourceWhiteRgb": [ 29, 151, 102 ], "actualPngRgba": [ 29, 151, 102, 255 ], "actualJpegRgb": [ 29, 151, 102 ] }, { "xy": [ 480, 128 ], "sourceDecodedRgba": [ 245, 177, 51, 255 ], "sourceWhiteRgb": [ 245, 177, 51 ], "actualPngRgba": [ 245, 177, 51, 255 ], "actualJpegRgb": [ 245, 177, 52 ] } ], "actualOperations": { "fixtureUploads": 1, "inputFiles": 1, "inputFile": "static-alpha-input.avif", "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)\nstatic-alpha-input.avif\n原始大小: 24.71 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-authored 8-bit static AVIF only, no HDR/10-bit/12-bit/wide-gamut/tone-mapping/AVIS/animation or arbitrary browser compatibility test." }, "checks": [ { "check": "static-alpha-input.avif/frozen-bytes-and-hash", "actual": [ 25307, "84c4b580a68d842ab80308243932e95595c326cba83c856cdceeaddd6fb8eed4" ], "expected": [ 25307, "84c4b580a68d842ab80308243932e95595c326cba83c856cdceeaddd6fb8eed4" ], "passed": true }, { "check": "static-alpha-input.avif/dimensions", "actual": [ 640, 400 ], "expected": [ 640, 400 ], "passed": true }, { "check": "static-alpha-input.avif/one-static-frame", "actual": [ 1, false ], "expected": [ 1, false ], "passed": true }, { "check": "jpeg-native.jpg/frozen-bytes-and-hash", "actual": [ 45419, "09c07d9752f2c0e4296c1b6f4887aef3aa7ce36ad75d7479f2635b059ec0b801" ], "expected": [ 45419, "09c07d9752f2c0e4296c1b6f4887aef3aa7ce36ad75d7479f2635b059ec0b801" ], "passed": true }, { "check": "jpeg-native.jpg/dimensions", "actual": [ 640, 400 ], "expected": [ 640, 400 ], "passed": true }, { "check": "jpeg-native.jpg/one-static-frame", "actual": [ 1, false ], "expected": [ 1, false ], "passed": true }, { "check": "png-native.png/frozen-bytes-and-hash", "actual": [ 30802, "83d1b9d50ed9e6aa38c22d993c8a123a09eb46fd51e399c69682686a63f06f77" ], "expected": [ 30802, "83d1b9d50ed9e6aa38c22d993c8a123a09eb46fd51e399c69682686a63f06f77" ], "passed": true }, { "check": "png-native.png/dimensions", "actual": [ 640, 400 ], "expected": [ 640, 400 ], "passed": true }, { "check": "png-native.png/one-static-frame", "actual": [ 1, false ], "expected": [ 1, false ], "passed": true }, { "check": "source-decode-matches-prepared-manifest", "actual": "4bb5a1f30dff5d8e1c0ec120e4a0436662dd4f5aedc127708c30cc8f4ab6f8d6", "expected": "4bb5a1f30dff5d8e1c0ec120e4a0436662dd4f5aedc127708c30cc8f4ab6f8d6", "passed": true }, { "check": "source-file-matches-manifest", "actual": [ 25307, "84c4b580a68d842ab80308243932e95595c326cba83c856cdceeaddd6fb8eed4" ], "expected": [ 25307, "84c4b580a68d842ab80308243932e95595c326cba83c856cdceeaddd6fb8eed4" ], "passed": true }, { "check": "source-nclx-is-present-not-empty-metadata", "actual": [ { "colourType": "nclx", "primaries": 1, "transferCharacteristics": 13, "matrixCoefficients": 6, "fullRange": true } ], "expected": [ { "colourType": "nclx", "primaries": 1, "transferCharacteristics": 13, "matrixCoefficients": 6, "fullRange": true } ], "passed": true }, { "check": "source-no-Exif-XMP-ICC", "actual": { "iccProfileBytes": 0, "exifTagCount": 0, "xmpPresent": false }, "expected": { "iccProfileBytes": 0, "exifTagCount": 0, "xmpPresent": false }, "passed": true }, { "check": "source-Pixi-8bit", "actual": [ [ 8, 8, 8 ], [ 8 ] ], "expected": [ [ 8, 8, 8 ], [ 8 ] ], "passed": true }, { "check": "source-not-high-bitdepth", "actual": [ [ false, false ], [ false, false ] ], "expected": [ [ false, false ], [ false, false ] ], "passed": true }, { "check": "jpeg-format-and-mode", "actual": [ "JPEG", "RGB" ], "expected": [ "JPEG", "RGB" ], "passed": true }, { "check": "png-format-and-mode", "actual": [ "PNG", "RGBA" ], "expected": [ "PNG", "RGBA" ], "passed": true }, { "check": "png-crcs-valid", "actual": true, "expected": true, "passed": true }, { "check": "png-no-animation-chunks", "actual": [], "expected": [], "passed": true }, { "check": "png-alpha-counts-preserved", "actual": { "fullyTransparent": 89505, "fullyOpaque": 151976, "partiallyTransparent": 14519 }, "expected": { "fullyTransparent": 89505, "fullyOpaque": 151976, "partiallyTransparent": 14519 }, "passed": true }, { "check": "png-all-alpha-values-preserved", "actual": true, "expected": true, "passed": true }, { "check": "png-RGBA-is-not-exact-source-decode", "actual": false, "expected": false, "passed": true }, { "check": "png-no-ICC-Exif-XMP", "actual": { "iccProfileBytes": 0, "exifTagCount": 0, "xmpPresent": false }, "expected": { "iccProfileBytes": 0, "exifTagCount": 0, "xmpPresent": false }, "passed": true }, { "check": "jpeg-all-opaque", "actual": { "fullyTransparent": 0, "fullyOpaque": 256000, "partiallyTransparent": 0 }, "expected": { "fullyTransparent": 0, "fullyOpaque": 256000, "partiallyTransparent": 0 }, "passed": true }, { "check": "jpeg-original-empty-background-white", "actual": [ 255, 255, 255, 255 ], "expected": [ 255, 255, 255, 255 ], "passed": true }, { "check": "jpeg-JFIF-present", "actual": true, "expected": true, "passed": true }, { "check": "jpeg-ICC-profile-bytes", "actual": 456, "expected": 456, "passed": true }, { "check": "jpeg-APP2-payload-bytes", "actual": [ 470 ], "expected": [ 470 ], "passed": true }, { "check": "jpeg-ICC-header", "actual": [ 456, "acsp" ], "expected": [ 456, "acsp" ], "passed": true }, { "check": "jpeg-no-Exif", "actual": 0, "expected": 0, "passed": true }, { "check": "jpeg-reencoded-nonzero-white-MAE", "actual": true, "expected": true, "passed": true }, { "check": "actual-receipt/fixtureUploads", "actual": 1, "expected": 1, "passed": true }, { "check": "actual-receipt/conversionRuns", "actual": 2, "expected": 2, "passed": true }, { "check": "actual-receipt/singleImageDownloads", "actual": 2, "expected": 2, "passed": true }, { "check": "actual-receipt/nativeZipDownloads", "actual": 0, "expected": 0, "passed": true }, { "check": "actual-receipt/keepExif", "actual": true, "expected": true, "passed": true }, { "check": "actual-receipt/originalOutputFormatRestoredJpegWithoutThirdRun", "actual": true, "expected": true, "passed": true }, { "check": "actual-receipt/ownToolTabClosedAfterReceipt", "actual": true, "expected": true, "passed": true }, { "check": "native-raw-hash-unchanged/static-alpha-input.avif", "actual": "84c4b580a68d842ab80308243932e95595c326cba83c856cdceeaddd6fb8eed4", "expected": "84c4b580a68d842ab80308243932e95595c326cba83c856cdceeaddd6fb8eed4", "passed": true }, { "check": "native-raw-hash-unchanged/jpeg-native.jpg", "actual": "09c07d9752f2c0e4296c1b6f4887aef3aa7ce36ad75d7479f2635b059ec0b801", "expected": "09c07d9752f2c0e4296c1b6f4887aef3aa7ce36ad75d7479f2635b059ec0b801", "passed": true }, { "check": "native-raw-hash-unchanged/png-native.png", "actual": "83d1b9d50ed9e6aa38c22d993c8a123a09eb46fd51e399c69682686a63f06f77", "expected": "83d1b9d50ed9e6aa38c22d993c8a123a09eb46fd51e399c69682686a63f06f77", "passed": true } ], "observations": { "sourceColour": "The input has nclx primaries1/transfer13/matrix6/full-range; no EXIF/XMP/ICC does not mean no colour metadata.", "pngAlpha": "Every decoded alpha byte matches the native AVIF input, including fully transparent and partial-alpha pixels.", "pngColour": "The native PNG RGBA bytes do not exactly equal Pillow/libavif-decoded source RGBA; report RGB differences per alpha scope and after white composite. This observation does not isolate a browser decoder, premultiplication, colour-management or encoding cause.", "jpeg": "The actual JPEG is opaque RGB. Empty source background samples become white; measured whole-image and region MAE compare to the decoded AVIF composited over white. Nonzero error is not a universal quality score.", "metadata": "JPEG contains JFIF and 456-byte ICC in a 470-byte APP2 payload; PNG has no ICC or EXIF metadata in this output." }, "limits": [ "One self-authored 8-bit static AVIF tested in one current browser/tool workflow.", "No 10-bit, 12-bit, HDR, wide-gamut, tone-mapping, AVIS, animated AVIF or arbitrary-browser support established.", "The pre-encoding source PNG is not substituted for the actual AVIF decoded-pixel reference.", "No lossless conversion or exact RGB preservation is claimed.", "Small-text and region metrics locate differences; no OCR readability or human visual preference score is established.", "Local analysis performs no new product upload, conversion or download." ], "nativeBytesUnmodified": true, "localAnalysisProductRuns": 0, "localAnalysisNetworkRequests": 0 }, "independentObservation": { "schemaVersion": 1, "status": "passed", "script": { "file": "independent-output-review.py", "bytes": 25715, "sha256": "00f8e4601799db4c1c574b5f04f6929afb2d96bf9e875a8f1bb253bd9c38d19c" }, "sourceBindings": [ { "file": "static-alpha-input.avif", "bytes": 25307, "sha256": "84c4b580a68d842ab80308243932e95595c326cba83c856cdceeaddd6fb8eed4" }, { "file": "jpeg-native.jpg", "bytes": 45419, "sha256": "09c07d9752f2c0e4296c1b6f4887aef3aa7ce36ad75d7479f2635b059ec0b801" }, { "file": "png-native.png", "bytes": 30802, "sha256": "83d1b9d50ed9e6aa38c22d993c8a123a09eb46fd51e399c69682686a63f06f77" }, { "file": "fixture-manifest.json", "bytes": 14242, "sha256": "5a160695016e65a414e149d99ac54346c017f0f900ee137707cd39e65073e527" }, { "file": "product-run-receipt.json", "bytes": 1209, "sha256": "e4540434b2fd7e79292fc894c309f4b985346ba61523b51f6a4bdc359d6c8064" } ], "methods": { "PNG": "Python standard-library signature/chunk bounds/CRC32/zlib/filter reconstruction of every RGBA byte; Pillow cross-check only", "JPEG": "Python standard-library marker/SOF/SOS/entropy-boundary/EOI/JFIF/ICC header parser; Pillow pixel decode", "AVIF": "Python standard-library ISO BMFF ftyp/pixi/av1C/nclx parse; Pillow actual AVIF RGBA decode", "pixelReference": "static-alpha-input.avif actual decoded RGBA; avif-source-rgba.png was not read", "Pillow": "12.3.0", "outputCheckCountIncludes": "Receipt consistency, frozen source bindings, input-reference consistency, output structures and output pixel observations; prior 47 input checks excluded" }, "priorInputVerification": { "checks": 47, "passed": 47, "source": "Earlier separate read-only input validation; not rerun or added to output check count" }, "outputChecks": { "checks": 41, "passed": 41, "failed": [], "details": [ { "id": "receipt-one-fixture-upload", "passed": true }, { "id": "receipt-input-basename", "passed": true }, { "id": "receipt-two-runs-two-single-downloads", "passed": true }, { "id": "receipt-jpeg-then-png", "passed": true }, { "id": "receipt-no-native-zip", "passed": true }, { "id": "receipt-settings-restored-without-third-run", "passed": true }, { "id": 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"png-alpha-all-pixels-identical", "passed": true }, { "id": "png-alpha-histogram-identical", "passed": true }, { "id": "png-rgba-is-not-byte-identical", "passed": true }, { "id": "png-rgb-differences-count-consistent", "passed": true }, { "id": "png-difference-strata-cover-image", "passed": true }, { "id": "png-no-exif-xmp-icc", "passed": true }, { "id": "jpeg-native-sha-bound", "passed": true }, { "id": "jpeg-markers-through-eoi-no-trailing", "passed": true }, { "id": "jpeg-one-baseline8bit640x400-sof", "passed": true }, { "id": "jpeg-three-components-one-scan", "passed": true }, { "id": "jpeg-pillow-rgb640x400-single-frame", "passed": true }, { "id": "jpeg-no-alpha-channel", "passed": true }, { "id": "jpeg-jfif-header", "passed": true }, { "id": "jpeg-icc-header-complete-rgb", "passed": true }, { "id": "jpeg-icc-bytes-match-pillow", "passed": true }, { "id": "jpeg-no-exif-or-xmp", "passed": true }, { "id": "jpeg-white-comparison-has256000pixels", "passed": true }, { "id": "jpeg-white-mae-is-nonzero", "passed": true } ] }, "inputReference": { "file": "static-alpha-input.avif", "mode": "RGBA", "dimensions": [ 640, 400 ], "frames": 1, "decodedRGBASha256": "4bb5a1f30dff5d8e1c0ec120e4a0436662dd4f5aedc127708c30cc8f4ab6f8d6", "alpha": { "fullyTransparent": 89505, "partiallyTransparent": 14519, "fullyOpaque": 151976, "histogram": { "0": 89505, "1": 27, "2": 8, "3": 16, "4": 54, "5": 13, "6": 6, "7": 7, "8": 129, "9": 4, "10": 7, "11": 14, "12": 13, "13": 17, "14": 9, "15": 10, "16": 128, "17": 20, "18": 13, "19": 13, "20": 8, "21": 4, "22": 19, "23": 8, "24": 145, "25": 12, "26": 6, "27": 2, "28": 2, "29": 10, "30": 2, "31": 5, "32": 121, "33": 6, "34": 2, "35": 2, "36": 91, "38": 3, "39": 5, "40": 159, "41": 4, "42": 1, "43": 2, "44": 17, "45": 2, "46": 7, "47": 8, "48": 121, "49": 17, "51": 2, "52": 33, "53": 1, "54": 2, "55": 21, "56": 120, "57": 5, "58": 2, "59": 2, "60": 20, "61": 5, "62": 5, "63": 7, "64": 121, "65": 2, "66": 9, "67": 6, "68": 6, "69": 3, 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"size": 390 }, { "type": "mdat", "offset": 422, "size": 24885 } ], "majorBrand": "avif", "minorVersion": 0, "compatibleBrands": [ "avif", "mif1", "miaf", "MA1A" ], "pixelInformationProperties": [ { "channels": 3, "bitsPerChannel": [ 8, 8, 8 ] }, { "channels": 1, "bitsPerChannel": [ 8 ] } ], "av1CodecConfigurationProperties": [ { "marker": 1, "version": 1, "sequenceProfile": 1, "highBitdepth": false, "twelveBit": false, "monochrome": false, "configurationPrefixHex": "81210000" }, { "marker": 1, "version": 1, "sequenceProfile": 0, "highBitdepth": false, "twelveBit": false, "monochrome": true, "configurationPrefixHex": "81011c00" } ], "colourProperties": [ { "colourType": "nclx", "primaries": 1, "transferCharacteristics": 13, "matrixCoefficients": 6, "fullRange": true } ] } }, "PNG": { "signatureValid": true, "allChunkCRCsValid": true, "width": 640, "height": 400, "bitDepth": 8, "colourType": 6, "interlace": 0, "chunks": [ { "type": "IHDR", "bytes": 13, "crc32": "3ef3d125" }, { "type": "IDAT", "bytes": 4096, "crc32": "c9be6e4c" }, { "type": "IDAT", "bytes": 4096, "crc32": "dd3c005c" }, { "type": "IDAT", "bytes": 4096, "crc32": "0b822e6b" }, { "type": "IDAT", "bytes": 4096, "crc32": "c80183cf" }, { "type": "IDAT", "bytes": 4096, "crc32": "3f579882" }, { "type": "IDAT", "bytes": 4096, "crc32": "8b6a8927" }, { "type": "IDAT", "bytes": 4096, "crc32": "54bc1afc" }, { "type": "IDAT", "bytes": 1971, "crc32": "f3676dbf" }, { "type": "IDAT", "bytes": 6, "crc32": "b9f239cf" }, { "type": "IEND", "bytes": 0, "crc32": "ae426082" } ], "filterRowCounts": { "2": 400 }, "decompressedFilteredBytes": 1024400, "decodedRGBABytes": 1024000, "decodedRGBASha256": "3f9cf05ce5863f394ad759879f3e41613d7cda8a5a531af9cd9cdb433f04274a", "zlibEndAndNoTrailingData": true, "alpha": { "fullyTransparent": 89505, "partiallyTransparent": 14519, "fullyOpaque": 151976, "histogram": { "0": 89505, "1": 27, "2": 8, "3": 16, "4": 54, "5": 13, "6": 6, "7": 7, "8": 129, "9": 4, "10": 7, "11": 14, "12": 13, "13": 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0.12008984375, 0.07938671875 ] }, "alpha0": { "pixels": 89505, "rgbDifferentPixels": 0, "rgbDifferentChannels": 0, "absoluteErrorSum": 0, "maximumAbsoluteChannelError": 0, "channelAbsoluteErrorSumsRGB": [ 0, 0, 0 ], "channelMaximumErrorsRGB": [ 0, 0, 0 ], "rgbEqualPixels": 89505, "rgbChannelMAE": 0.0, "channelMAEsRGB": [ 0.0, 0.0, 0.0 ] }, "alphaPartial": { "pixels": 14519, "rgbDifferentPixels": 13805, "rgbDifferentChannels": 27862, "absoluteErrorSum": 79677, "maximumAbsoluteChannelError": 237, "channelAbsoluteErrorSumsRGB": [ 28611, 30743, 20323 ], "channelMaximumErrorsRGB": [ 237, 221, 198 ], "rgbEqualPixels": 714, "rgbChannelMAE": 1.8292582133755768, "channelMAEsRGB": [ 1.9705902610372614, 2.117432330050279, 1.39975204903919 ] }, "alpha255": { "pixels": 151976, "rgbDifferentPixels": 0, "rgbDifferentChannels": 0, "absoluteErrorSum": 0, "maximumAbsoluteChannelError": 0, "channelAbsoluteErrorSumsRGB": [ 0, 0, 0 ], "channelMaximumErrorsRGB": [ 0, 0, 0 ], "rgbEqualPixels": 151976, "rgbChannelMAE": 0.0, "channelMAEsRGB": [ 0.0, 0.0, 0.0 ] } }, "whiteCompositeComparedToInputWhiteComposite": { "formula": "(sourceChannel * alpha + 255 * (255 - alpha) + 127) // 255", "whiteCompositeRGBSha256": "850a0b61fdb1716c287577e62bdb28d97d10ced743dcadcb98d296bf90fa5840", "differenceBySourceAlpha": { "all": { "pixels": 256000, "rgbDifferentPixels": 4387, "rgbDifferentChannels": 6226, "absoluteErrorSum": 6226, "maximumAbsoluteChannelError": 1, "channelAbsoluteErrorSumsRGB": [ 1849, 2374, 2003 ], "channelMaximumErrorsRGB": [ 1, 1, 1 ], "rgbEqualPixels": 251613, "rgbChannelMAE": 0.008106770833333334, "channelMAEsRGB": [ 0.00722265625, 0.0092734375, 0.00782421875 ] }, "alpha0": { "pixels": 89505, "rgbDifferentPixels": 0, "rgbDifferentChannels": 0, "absoluteErrorSum": 0, "maximumAbsoluteChannelError": 0, "channelAbsoluteErrorSumsRGB": [ 0, 0, 0 ], "channelMaximumErrorsRGB": [ 0, 0, 0 ], "rgbEqualPixels": 89505, "rgbChannelMAE": 0.0, "channelMAEsRGB": [ 0.0, 0.0, 0.0 ] }, "alphaPartial": { "pixels": 14519, "rgbDifferentPixels": 4387, "rgbDifferentChannels": 6226, "absoluteErrorSum": 6226, "maximumAbsoluteChannelError": 1, "channelAbsoluteErrorSumsRGB": [ 1849, 2374, 2003 ], "channelMaximumErrorsRGB": [ 1, 1, 1 ], "rgbEqualPixels": 10132, "rgbChannelMAE": 0.14293913722249008, "channelMAEsRGB": [ 0.12735036848267786, 0.16350988360079896, 0.13795715958399338 ] }, "alpha255": { "pixels": 151976, "rgbDifferentPixels": 0, "rgbDifferentChannels": 0, "absoluteErrorSum": 0, "maximumAbsoluteChannelError": 0, "channelAbsoluteErrorSumsRGB": [ 0, 0, 0 ], "channelMaximumErrorsRGB": [ 0, 0, 0 ], "rgbEqualPixels": 151976, "rgbChannelMAE": 0.0, "channelMAEsRGB": [ 0.0, 0.0, 0.0 ] } } } }, "JPEG": { "soiValid": true, "eoiValidAndNoTrailingBytes": true, "segments": [ { "marker": "FFE0", "offset": 2, "payloadBytes": 14 }, { "marker": "FFE2", "offset": 20, "payloadBytes": 470 }, { "marker": "FFDB", "offset": 494, "payloadBytes": 65 }, { "marker": "FFDB", "offset": 563, "payloadBytes": 65 }, { "marker": "FFC0", "offset": 632, "payloadBytes": 15 }, { "marker": "FFC4", "offset": 651, "payloadBytes": 27 }, { "marker": "FFC4", "offset": 682, "payloadBytes": 100 }, { "marker": "FFC4", "offset": 786, "payloadBytes": 26 }, { "marker": "FFC4", "offset": 816, "payloadBytes": 67 }, { "marker": "FFDA", "offset": 887, "payloadBytes": 10 } ], "frames": [ { "marker": "FFC0", "precision": 8, "height": 400, "width": 640, "components": [ { "id": 1, "horizontalSampling": 2, "verticalSampling": 2, "quantizationTable": 0 }, { "id": 2, "horizontalSampling": 1, "verticalSampling": 1, "quantizationTable": 1 }, { "id": 3, "horizontalSampling": 1, "verticalSampling": 1, "quantizationTable": 1 } ] } ], "scanCount": 1, "jfif": [ { "identifier": "JFIF", "version": [ 1, 1 ], "densityUnit": 0, "xDensity": 1, "yDensity": 1, "thumbnailDimensions": [ 0, 0 ] } ], "iccProfile": { "chunks": 1, "bytes": 456, "declaredBytes": 456, "sha256": "12afb4d9953adee0607d347daee5b78b18d6b3cab2d572b88970703f5edb37bc", "versionHex": "04300000", "deviceClass": "mntr", "dataColourSpace": "RGB ", "profileConnectionSpace": "XYZ ", "signature": "acsp", "tagCount": 9 }, "exifAPP1Present": false, "mode": "RGB", "dimensions": [ 640, 400 ], "decodedRGBSha256": "49577740332ca14f777f1b3a474bd7d2395f7f5a3344d48291ec2b6c1a8a366d", "comparedToInputWhiteComposite": { "formula": "(sourceChannel * alpha + 255 * (255 - alpha) + 127) // 255", "whiteCompositeRGBSha256": "850a0b61fdb1716c287577e62bdb28d97d10ced743dcadcb98d296bf90fa5840", "differenceBySourceAlpha": { "all": { "pixels": 256000, "rgbDifferentPixels": 121867, "rgbDifferentChannels": 259585, "absoluteErrorSum": 939451, "maximumAbsoluteChannelError": 89, "channelAbsoluteErrorSumsRGB": [ 392478, 221502, 325471 ], "channelMaximumErrorsRGB": [ 72, 38, 89 ], "rgbEqualPixels": 134133, "rgbChannelMAE": 1.2232434895833333, "channelMAEsRGB": [ 1.5331171875, 0.8652421875, 1.27137109375 ] }, "alpha0": { "pixels": 89505, "rgbDifferentPixels": 29042, "rgbDifferentChannels": 36063, "absoluteErrorSum": 99516, "maximumAbsoluteChannelError": 20, "channelAbsoluteErrorSumsRGB": [ 46968, 33186, 19362 ], "channelMaximumErrorsRGB": [ 18, 20, 15 ], "rgbEqualPixels": 60463, "rgbChannelMAE": 0.37061616669459807, "channelMAEsRGB": [ 0.5247528071057482, 0.3707725825372884, 0.2163231104407575 ] }, "alphaPartial": { "pixels": 14519, "rgbDifferentPixels": 7850, "rgbDifferentChannels": 19000, "absoluteErrorSum": 67369, "maximumAbsoluteChannelError": 38, "channelAbsoluteErrorSumsRGB": [ 24323, 12523, 30523 ], "channelMaximumErrorsRGB": [ 38, 20, 33 ], "rgbEqualPixels": 6669, "rgbChannelMAE": 1.5466859517413962, "channelMAEsRGB": [ 1.6752531166058269, 0.8625249672842482, 2.1022797713341137 ] }, "alpha255": { "pixels": 151976, "rgbDifferentPixels": 84975, "rgbDifferentChannels": 204522, "absoluteErrorSum": 772566, "maximumAbsoluteChannelError": 89, "channelAbsoluteErrorSumsRGB": [ 321187, 175793, 275586 ], "channelMaximumErrorsRGB": [ 72, 38, 89 ], "rgbEqualPixels": 67001, "rgbChannelMAE": 1.6944912354582302, "channelMAEsRGB": [ 2.1134060641153867, 1.1567155340316893, 1.813352108227615 ] } } } }, "limits": [ "Local review of one real static 8-bit AVIF input and the two supplied native output files; receipt counts are read from the supplied UI receipt, not independently witnessed here.", "PNG retains every alpha byte in this fixture, but full decoded RGBA differs from the local Pillow AVIF decode. RGB difference statistics do not establish the cause.", "A nonzero JPEG error against the specified white composite is measured rather than treated as a failed conversion or evidence of an exact pixel-preservation guarantee.", "JFIF and an embedded ICC profile remain in JPEG. Absence of Exif/XMP is not absence of all metadata or colour information.", "The nclx colour property remains present in the AVIF input; metadata is not generically empty.", "No conclusions about HDR, 10/12-bit, wide gamut, tone mapping, AVIS, animation, arbitrary AVIF files, other decoders or browsers.", "No product changes, network requests, browser operations, website source/dist reads, raw input/output writes or main-checker imports/reads." ], "pathScan": { "absolutePathsFound": [], "fileReferencesAreBasenames": true } }, "actualOperations": { "fixtureUploads": 1, "inputFiles": 1, "inputFile": "static-alpha-input.avif", "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)\nstatic-alpha-input.avif\n原始大小: 24.71 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-authored 8-bit static AVIF only, no HDR/10-bit/12-bit/wide-gamut/tone-mapping/AVIS/animation or arbitrary browser compatibility test." }, "marketEvidence": { "checkedAt": "2026-10-17 Asia/Shanghai", "seed": "avif转jpg", "dateBounds": [ "2026-07-17", "2026-10-14" ], "selectedDuration": "3M", "scope": "All countries/languages/devices", "seedImpressionsDisplayed": "1.1K", "exportRows": 9, "exportSha256": "840bbbfa9f859e4882ca92cd3e0b7be98803f45db0c000eb769bbb7b86816c8a", "matchingConversionRows": [ { "Keyword": "avif jpg", "Trends": "[0,0,0,22,0,20,0,0,23,0,0,21]", "Impressions": "86" }, { "Keyword": "avif文件转jpg", "Trends": "[229,260,247,269,246,233,189,257,246,231,209,190]", "Impressions": "2806" }, { "Keyword": "avif to jpg", "Trends": "[2404,2333,2297,2267,2319,2227,2356,2542,2557,2433,2531,2363]", "Impressions": "28629" } ], "limits": [ "Market impressions are not monthly search volume, site traffic, or live rank.", "Typo/generic queries are not all assigned as conversion intent.", "Current support is established by the separate actual native-output receipt, not by this earlier market record." ] }, "sourceHashes": [ { "file": "static-alpha-input.avif", "bytes": 25307, "sha256": "84c4b580a68d842ab80308243932e95595c326cba83c856cdceeaddd6fb8eed4" }, { "file": "jpeg-native.jpg", "bytes": 45419, "sha256": "09c07d9752f2c0e4296c1b6f4887aef3aa7ce36ad75d7479f2635b059ec0b801" }, { "file": "png-native.png", "bytes": 30802, "sha256": "83d1b9d50ed9e6aa38c22d993c8a123a09eb46fd51e399c69682686a63f06f77" }, { "file": "jpeg-settings.jpg", "bytes": 81912, "sha256": "148a2a673f12fd2d21e6e6e054befde399b87a72d7fd806d71e647db447ba9ff" }, { "file": "png-settings.jpg", "bytes": 82547, "sha256": "73d2b38ad8ff50eed3f5e6b3df83c953159f38c6fbc477cffdacf20f1484c895" } ], "sourceReportHashes": [ { "file": "fixture-manifest.json", "sha256": "5a160695016e65a414e149d99ac54346c017f0f900ee137707cd39e65073e527" }, { "file": "native-output-observations.json", "sha256": "21371b0fe3018dcdd0e0285c78087a4a40f300c69dbca45d4fd2b1843840be8a" }, { "file": "independent-output-review.json", "sha256": "b0dbb4aa3c5b3dbca7e4e33b9f75e0c47e9767e935735be7af132eb0298f722b" }, { "file": "product-run-receipt.json", "sha256": "e4540434b2fd7e79292fc894c309f4b985346ba61523b51f6a4bdc359d6c8064" }, { "file": "keyword-research-review.json", "sha256": "69dce638efefbeea849431d7cc8949476f0eccc50a376ff5e1455f9ee7ada870" }, { "file": "keyword-research-export.csv", "sha256": "840bbbfa9f859e4882ca92cd3e0b7be98803f45db0c000eb769bbb7b86816c8a" } ], "newBrowserOrProductRunsForPackaging": 0, "comparisonScope": "Local decoding of only the actual encoded AVIF and two actual outputs. No Sharp/source-responsive preview is used as a pixel/colour reference; checkerboard only shows alpha.", "limits": [ "One self-authored 8-bit static AVIF tested in one current browser/tool workflow.", "No 10-bit, 12-bit, HDR, wide-gamut, tone-mapping, AVIS, animated AVIF or arbitrary-browser support established.", "The pre-encoding source PNG is not substituted for the actual AVIF decoded-pixel reference.", "No lossless conversion or exact RGB preservation is claimed.", "Small-text and region metrics locate differences; no OCR readability or human visual preference score is established.", "Local analysis performs no new product upload, conversion or download." ] }