a.jpg (4.0 MB)
(Images are cattle grazing)
When converting a tif to jpg with:
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convert a.tif a.jpg
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a.tif: unknown field with tag 37724 (0x935c) encountered. `TIFFReadDirectory' @ warning/tiff.c/TIFFWarnings/704.
Tag 37724 is a Photoshop-specific TIFF Tag described as:
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tImageSourceData . Begins with the null-terminated string " Adobe Photoshop Document Data Block ", (**PSB** " Adobe Photoshop Document Data V0002 "), followed by data of various types.
In cases where the tag's only information is "Adobe Photoshop Document Data Block" then it could be ignored.Adobe Photoshop specific image source data tag. This section has the layer and mask information found in a typical layered Photoshop file.
Field: ImageSourceData
Tag: 37724 (935C.H)
Type: UNDEFINED
Count: number of bytes for section
The section starts with a character string of "Adobe Photoshop Document Data Block" including the null termination character.
The remainder of the count, after subtracting the length of the above mentioned string, is a series of tagged data types in the following format:The various types are mentioned here with further documentation in the Photoshop File Formats.pdf.
- 4 bytes Signature ‘8BIM’
- 4 bytes Type various types (see below)
- 4 bytes Length length in bytes, variable for each type, padded to a 4 byte offset
The available types are:
- ‘Layr’ Layer Data
- ‘LMsk’ User Mask Same as Global layer mask info table
- ‘Patt’ Pattern
- ‘Anno’ Annotations
Running identify also gives the non-fatal warning:
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identify: a.tif: unknown field with tag 37724 (0x935c) encountered. `TIFFReadDirectory' @ warning/tiff.c/TIFFWarnings/704.Running "identify -verbose a.jpg" gives:Image: a.tif
Format: TIFF (Tagged Image File Format)
Class: DirectClass
Geometry: 2100x1500+0+0
Resolution: 300x300
Print size: 7x5
Units: PixelsPerInch
Type: ColorSeparation
Base type: ColorSeparation
Endianess: MSB
Colorspace: CMYK
Depth: 8-bit
Channel depth:
cyan: 8-bit
magenta: 8-bit
yellow: 8-bit
black: 8-bit
Channel statistics:
Cyan:
min: 0 (0)
max: 255 (1)
mean: 162.165 (0.63594)
standard deviation: 39.888 (0.156424)
kurtosis: 1.94603
skewness: -1.37037
Magenta:
min: 0 (0)
max: 255 (1)
mean: 113.179 (0.44384)
standard deviation: 54.0543 (0.211977)
kurtosis: -0.812667
skewness: -0.412032
Yellow:
min: 0 (0)
max: 255 (1)
mean: 160.781 (0.630514)
standard deviation: 51.0776 (0.200304)
kurtosis: 2.89463
skewness: -1.92863
Black:
min: 0 (0)
max: 228 (0.894118)
mean: 90.0339 (0.353074)
standard deviation: 70.9254 (0.278139)
kurtosis: -1.2624
skewness: 0.323196
Image statistics:
Overall:
min: 0 (0)
max: 255 (1)
mean: 105.232 (0.412674)
standard deviation: 77.2622 (0.302989)
kurtosis: -1.54447
skewness: -0.242523
Total ink density: 299%
Rendering intent: Undefined
Interlace: None
Background color: white
Border color: cmyk(223,223,223,0)
Matte color: grey74
Transparent color: black
Compose: Over
Page geometry: 2100x1500+0+0
Dispose: Undefined
Iterations: 0
Compression: None
Orientation: TopLeft
Properties:
date:create: 2013-02-24T06:44:55+04:00
date:modify: 2013-02-24T05:51:49+04:00
signature: a6fb7eebb43c66120bc230bd7b417436ba5315640908c27773f3f79a59a5c697
tiff:photometric: separated
tiff:rows-per-strip: 1
Profiles:
Profile-8bim: 6360 bytes
Profile-tiff:37724: 36 bytes
Artifacts:
verbose: true
Tainted: False
Filesize: 12.61MB
Number pixels: 3.15M
Pixels per second: 39.37M
User time: 0.090u
Elapsed time: 0:01.080
Version: ImageMagick 6.6.2-6 2012-08-17 Q16 http://www.imagemagick.org
Version info:Image: a.jpg
Format: JPEG (Joint Photographic Experts Group JFIF format)
Class: DirectClass
Geometry: 2100x1500+0+0
Resolution: 300x300
Print size: 7x5
Units: PixelsPerInch
Type: ColorSeparation
Endianess: Undefined
Colorspace: CMYK
Depth: 8-bit
Channel depth:
cyan: 8-bit
magenta: 8-bit
yellow: 8-bit
black: 8-bit
Channel statistics:
Cyan:
min: 0 (0)
max: 255 (1)
mean: 162.17 (0.635961)
standard deviation: 39.8971 (0.156459)
kurtosis: 1.94155
skewness: -1.3691
Magenta:
min: 0 (0)
max: 255 (1)
mean: 113.185 (0.443864)
standard deviation: 54.0673 (0.212029)
kurtosis: -0.815962
skewness: -0.410681
Yellow:
min: 0 (0)
max: 255 (1)
mean: 160.787 (0.630539)
standard deviation: 51.1101 (0.200432)
kurtosis: 2.88207
skewness: -1.92432
Black:
min: 0 (0)
max: 229 (0.898039)
mean: 90.0631 (0.353189)
standard deviation: 70.9066 (0.278065)
kurtosis: -1.26201
skewness: 0.324144
Image statistics:
Overall:
min: 0 (0)
max: 255 (1)
mean: 105.241 (0.41271)
standard deviation: 77.2664 (0.303006)
kurtosis: -1.54434
skewness: -0.241958
Total ink density: 299%
Rendering intent: Undefined
Interlace: None
Background color: white
Border color: cmyk(223,223,223,0)
Matte color: grey74
Transparent color: black
Compose: Over
Page geometry: 2100x1500+0+0
Dispose: Undefined
Iterations: 0
Compression: JPEG
Quality: 92
Orientation: Undefined
Properties:
date:create: 2013-02-24T18:49:25+04:00
date:modify: 2013-02-24T18:49:25+04:00
jpeg:colorspace: 4
jpeg:sampling-factor: 1x1,1x1,1x1,1x1
signature: d2fdabfe6b1f77a4cd4660956d04cd4719a1e35b1ed611b90579e1582d0dce6f
Profiles:
Profile-8bim: 6360 bytes
Artifacts:
verbose: true
Tainted: False
Filesize: 4.16MB
Number pixels: 3.15M
Pixels per second: 5.943M
User time: 0.530u
Elapsed time: 0:01.530
Version: ImageMagick 6.6.2-6 2012-08-17 Q16 http://www.imagemagick.org
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Version: ImageMagick 6.6.2-6 2012-08-17 Q16 http://www.imagemagick.org
Copyright: Copyright (C) 1999-2010 ImageMagick Studio LLC
Features: OpenMP
