【图像处理】JPEG Tags

JPEG Tags

This table lists information extracted by ExifTool from JPEG images.

Tag ID Tag Name Writable Values / Notes 'APP0' JFIF  JFXX  CIFF  AVI1  Ocad - - - - - --> JFIF Tags  --> JFIF Extension Tags  --> CanonRaw Tags  --> JPEG AVI1 Tags  --> JPEG Ocad Tags 'APP1' EXIF  ExtendedXMP  XMP  QVCI  FLIR - - - - - --> EXIF Tags  --> XMP Tags  --> XMP Tags  --> Casio QVCI Tags  --> FLIR FFF Tags 'APP2' ICC_Profile  FPXR  MPF  PreviewImage - - - no --> ICC_Profile Tags  --> FlashPix Tags  --> MPF Tags  (Samsung APP2 preview image) 'APP3' Meta  Stim  PreviewImage - - no --> Kodak Meta Tags  --> Stim Tags  (Samsung/HP preview image) 'APP4' Scalado  FPXR  PreviewImage - - no --> Scalado Tags  --> FlashPix Tags  (continued from APP3) 'APP5' RMETA  PreviewImage - no --> Ricoh RMETA Tags  (continued from APP4) 'APP6' EPPIM  NITF  HP_TDHD - - - --> JPEG EPPIM Tags  --> JPEG NITF Tags  --> HP TDHD Tags 'APP7' Pentax  Qualcomm - - --> Pentax Tags  --> Qualcomm Tags 'APP8' SPIFF - --> JPEG SPIFF Tags 'APP9' MediaJukebox - --> JPEG MediaJukebox Tags 'APP10' Comment no (PhotoStudio Unicode comment) 'APP11' JPEG-HDR - --> JPEG HDR Tags 'APP12' PictureInfo  Ducky - - --> APP12 PictureInfo Tags  --> APP12 Ducky Tags 'APP13' Photoshop  Adobe_CM - - --> Photoshop Tags  --> JPEG AdobeCM Tags 'APP14' Adobe yes --> JPEG Adobe Tags 'APP15' GraphicConverter - --> JPEG GraphConv Tags 'COM' Comment yes   'DQT' DefineQuantizationTable no (used to calculate the Extra JPEGDigest tag value) 'SOF' StartOfFrame - --> JPEG SOF Tags 'Trailer' AFCP  CanonVRD  FotoStation  PhotoMechanic  MIE  Samsung  PreviewImage - - - - - - yes --> AFCP Tags  --> CanonVRD Tags  --> FotoStation Tags  --> PhotoMechanic Tags  --> MIE Tags  --> Samsung Trailer Tags

JPEG AVI1 Tags

This information may be found in APP0 of JPEG image data from AVI videos.

Index1 Tag Name Writable Values / Notes 0 InterleavedField no 0 = Not Interleaved  1 = Odd  2 = Even

JPEG Ocad Tags

Tags extracted from the JPEG APP0 "Ocad" segment (found in Photobucket images).

Tag ID Tag Name Writable Values / Notes 'Rev' OcadRevision no

JPEG EPPIM Tags

APP6 is used in by the Toshiba PDR-M700 to store a TIFF structure containing PrintIM information.

Tag ID Tag Name Writable Values / Notes 0xc4a5 PrintIM undef --> PrintIM Tags

JPEG NITF Tags

Information in APP6 used by the National Imagery Transmission Format. See http://www.gwg.nga.mil/ntb/baseline/docs/n010697/bwcguide25aug98.pdf for the official specification.

Index1 Tag Name Writable Values / Notes 0 NITFVersion no   2 ImageFormat no 'B' = IMode B 3 BlocksPerRow no   5 BlocksPerColumn no   7 ImageColor no 0 = Monochrome 8 BitDepth no   9 ImageClass no 0 = General Purpose  4 = Tactical Imagery 10 JPEGProcess no 1 = Baseline sequential DCT, Huffman coding, 8-bit samples  4 = Extended sequential DCT, Huffman coding, 12-bit samples 11 Quality no   12 StreamColor no 0 = Monochrome 13 StreamBitDepth no   14 Flags no

JPEG SPIFF Tags

This information is found in APP8 of SPIFF-style JPEG images (the "official" yet rarely used JPEG file format standard: Still Picture Interchange File Format). See http://www.jpeg.org/public/spiff.pdf for the official specification.

Index1 Tag Name Writable Values / Notes 0 SPIFFVersion no   2 ProfileID no 0 = Not Specified  1 = Continuous-tone Base  2 = Continuous-tone Progressive  3 = Bi-level Facsimile  4 = Continuous-tone Facsimile 3 ColorComponents no   6 ImageHeight no (at index 4 in specification, but there are 2 extra bytes here in my only SPIFF sample, version 1.2) 10 ImageWidth no   14 ColorSpace no 0 = Bi-level  1 = YCbCr, ITU-R BT 709, video  2 = No color space specified  3 = YCbCr, ITU-R BT 601-1, RGB  4 = YCbCr, ITU-R BT 601-1, video  8 = Gray-scale  9 = PhotoYCC  10 = RGB  11 = CMY  12 = CMYK  13 = YCCK  14 = CIELab 15 BitsPerSample no   16 Compression no 0 = Uncompressed, interleaved, 8 bits per sample  1 = Modified Huffman  2 = Modified READ  3 = Modified Modified READ  4 = JBIG  5 = JPEG 17 ResolutionUnit no 0 = None  1 = inches  2 = cm 18 YResolution no   22 XResolution no

JPEG MediaJukebox Tags

Tags found in the XML metadata of the "Media Jukebox" APP9 segment.

Tag Name Writable Values / Notes Album no   Caption no   Date no   Keywords no   Name no   People no   Places no   Tool_Name no   Tool_Version no

JPEG HDR Tags

Information extracted from APP11 of a JPEG-HDR image.

Tag ID Tag Name Writable Values / Notes 'RatioImage' RatioImage no (the embedded JPEG-compressed ratio image) 'alp' Alpha no   'bet' Beta no   'cor' CorrectionMethod no   'ln0' Ln0 no   'ln1' Ln1 no   's2n' S2n no   'ver' JPEG-HDRVersion no

JPEG AdobeCM Tags

The "Adobe_CM" APP13 segment presumably contains color management information, but the meaning of the data is currently unknown. If anyone has an idea about what this means, please let me know.

Index2 Tag Name Writable Values / Notes 0 AdobeCMType no

JPEG Adobe Tags

The "Adobe" APP14 segment stores image encoding information for DCT filters. This segment may be copied or deleted as a block using the Extra "Adobe" tag, but note that it is not deleted by default when deleting all metadata because it may affect the appearance of the image.

Index2 Tag Name Writable Values / Notes 0 DCTEncodeVersion no   1 APP14Flags0 no 0x0 = (none)  Bit 15 = Encoded with Blend=1 downsampling 2 APP14Flags1 no 0x0 = (none) 3 ColorTransform no 0 = Unknown (RGB or CMYK)  1 = YCbCr  2 = YCCK

JPEG GraphConv Tags

APP15 is used by GraphicConverter to store JPEG quality.

Tag ID Tag Name Writable Values / Notes 'Q' Quality no

JPEG SOF Tags

This information is extracted from the JPEG Start Of Frame segment.

Tag Name Writable Values / Notes BitsPerSample no   ColorComponents no   EncodingProcess no 0x0 = Baseline DCT, Huffman coding  0x1 = Extended sequential DCT, Huffman coding  0x2 = Progressive DCT, Huffman coding  0x3 = Lossless, Huffman coding  0x5 = Sequential DCT, differential Huffman coding  0x6 = Progressive DCT, differential Huffman coding  0x7 = Lossless, Differential Huffman coding  0x9 = Extended sequential DCT, arithmetic coding  0xa = Progressive DCT, arithmetic coding  0xb = Lossless, arithmetic coding  0xd = Sequential DCT, differential arithmetic coding  0xe = Progressive DCT, differential arithmetic coding  0xf = Lossless, differential arithmetic coding ImageHeight no   ImageWidth no   YCbCrSubSampling no (calculated from components table) '1 1' = YCbCr4:4:4 (1 1)  '1 2' = YCbCr4:4:0 (1 2)  '1 4' = YCbCr4:4:1 (1 4)  '2 1' = YCbCr4:2:2 (2 1)  '2 2' = YCbCr4:2:0 (2 2)  '2 4' = YCbCr4:2:1 (2 4)  '4 1' = YCbCr4:1:1 (4 1)  '4 2' = YCbCr4:1:0 (4 2)