JPEG Tags

This table lists information extracted by ExifTool from JPEG images.

Tag ID Tag Name Writable Values / Notes 'APP0' JFIF JFXX CIFF - - - --> JFIF Tags --> JFIF Extension Tags --> CanonRaw Tags 'APP1' EXIF XMP - - --> EXIF Tags --> XMP Tags 'APP2' ICC_Profile FPXR - - --> ICC_Profile Tags --> FlashPix Tags 'APP3' Meta - --> Kodak Meta Tags 'APP5' RMETA - --> Ricoh RMETA Tags 'APP6' EPPIM - --> JPEG EPPIM Tags 'APP8' SPIFF - --> JPEG SPIFF Tags 'APP10' Comment N (PhotoStudio Unicode comment) 'APP12' PictureInfo Ducky - - --> APP12 PictureInfo Tags --> APP12 Ducky Tags 'APP13' Photoshop Adobe_CM - - --> Photoshop Tags --> JPEG AdobeCM Tags 'APP14' Adobe - --> JPEG Adobe Tags 'APP15' GraphicConverter - --> JPEG GraphConv Tags 'COM' Comment Y   'SOF' StartOfFrame - --> JPEG SOF Tags 'Trailer' AFCP CanonVRD FotoStation PhotoMechanic MIE PreviewImage - - - - - Y --> AFCP Tags --> CanonVRD Tags --> FotoStation Tags --> PhotoMechanic Tags --> MIE Tags

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 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).

Index Tag Name Writable Values / Notes 0 SPIFFVersion N   2 ProfileID N 0 = Not Specified 1 = Continuous-tone Base 2 = Continuous-tone Progressive 3 = Bi-level Facsimile 4 = Continuous-tone Facsimile 3 ColorComponents N   6 ImageHeight N (at index 4 in specification, but there are 2 extra bytes here in my only SPIFF sample, version 1.2) 10 ImageWidth N   14 ColorSpace N 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 N   16 Compression N 0 = Uncompressed, interleaved, 8 bits per sample 1 = Modified Huffman 2 = Modified READ 3 = Modified Modified READ 4 = JBIG 5 = JPEG 17 ResolutionUnit N 0 = None 1 = inches 2 = cm 18 YResolution N   22 XResolution N

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.

Index Tag Name Writable Values / Notes 0 AdobeCMType N

JPEG Adobe Tags

The "Adobe" APP14 segment stores image encoding information for DCT filters.

Index Tag Name Writable Values / Notes 0 DCTEncodeVersion N   1 APP14Flags0 N Bit 15 = Encoded with Blend=1 downsampling 2 APP14Flags1 N   3 ColorTransform N 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 N

JPEG SOF Tags

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

Tag Name Writable Values / Notes BitsPerSample N   ColorComponents N   EncodingProcess N 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 N   ImageWidth N   YCbCrSubSampling N (calculated from components table) '1 1' = YCbCr4:4:4 (1 1) '1 2' = YCbCr4:4:0 (1 2) '2 1' = YCbCr4:2:2 (2 1) '2 2' = YCbCr4:2:0 (2 2) '4 1' = YCbCr4:1:1 (4 1) '4 2' = YCbCr4:1:0 (4 2)

<-- ExifTool Tag Names