JPEG Tags
This table lists information extracted by ExifTool from JPEG images.
This information may be found in APP0 of JPEG image data from AVI videos.
| Index1 | Tag Name |
Writable | Values / Notes |
|---|
| 0 |
InterleavedField |
N |
0 = Not Interleaved
1 = Odd
2 = Even |
|
Tags extracted from the JPEG APP0 "Ocad" segment (found in Photobucket
images).
| Tag ID | Tag Name |
Writable | Values / Notes |
|---|
| 'Rev' |
OcadRevision |
N |
|
|
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 |
|
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 |
N |
|
| 2 |
ImageFormat |
N |
'B' = IMode B |
| 3 |
BlocksPerRow |
N |
|
| 5 |
BlocksPerColumn |
N |
|
| 7 |
ImageColor |
N |
0 = Monochrome |
| 8 |
BitDepth |
N |
|
| 9 |
ImageClass |
N |
0 = General Purpose
4 = Tactical Imagery |
| 10 |
JPEGProcess |
N |
1 = Baseline sequential DCT, Huffman coding, 8-bit samples
4 = Extended sequential DCT, Huffman coding, 12-bit samples |
| 11 |
Quality |
N |
|
| 12 |
StreamColor |
N |
0 = Monochrome |
| 13 |
StreamBitDepth |
N |
|
| 14 |
Flags |
N |
|
|
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 |
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 |
|
|
Tags found in the XML metadata of the "Media Jukebox" APP9 segment.
| Tag Name |
Writable | Values / Notes |
|---|
| Album |
N |
|
| Caption |
N |
|
| Date |
N |
|
| Keywords |
N |
|
| Name |
N |
|
| People |
N |
|
| Places |
N |
|
| Tool_Name |
N |
|
| Tool_Version |
N |
|
|
Information extracted from APP11 of a JPEG-HDR image.
| Tag ID | Tag Name |
Writable | Values / Notes |
|---|
| 'RatioImage' |
RatioImage |
N |
(the embedded JPEG-compressed ratio image) |
| 'alp' |
Alpha |
N |
|
| 'bet' |
Beta |
N |
|
| 'cor' |
CorrectionMethod |
N |
|
| 'ln0' |
Ln0 |
N |
|
| 'ln1' |
Ln1 |
N |
|
| 's2n' |
S2n |
N |
|
| 'ver' |
JPEG-HDRVersion |
N |
|
|
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 |
N |
|
|
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 |
N |
|
| 1 |
APP14Flags0 |
N |
0x0 = (none)
Bit 15 = Encoded with Blend=1 downsampling |
| 2 |
APP14Flags1 |
N |
0x0 = (none) |
| 3 |
ColorTransform |
N |
0 = Unknown (RGB or CMYK)
1 = YCbCr
2 = YCCK |
|
APP15 is used by GraphicConverter to store JPEG quality.
| Tag ID | Tag Name |
Writable | Values / Notes |
|---|
| 'Q' |
Quality |
N |
|
|
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)
'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) |
|
|
(This document generated automatically by Image::ExifTool::BuildTagLookup)
Last revised Sep 17, 2014
<-- ExifTool Tag Names
