2011.11.30 11:23 "[Tiff] Inconsistent metadata report for CMYK 8-bit
image", by Mateusz_Łoskot
Thread
2011.11.30 11:23 "[Tiff] Inconsistent metadata report for CMYK 8-bit image", by Mateusz_Łoskot
Hi,
I have a CMYK TIFF image and I'm having problems to identify what is its actual configuration.
I'm not sure if I can post images as attachment to the list, so I uploaded it to my server:
http://mateusz.loskot.net/tmp/Shadow_cmyk8.tif (2.6 MB)
http://mateusz.loskot.net/tmp/Shadow_cmyk8.zip (0.5 MB)
I have tried three different tools and each of them reports slightly different configuration:
#################################################################### 1) tiffinfo (libtiff 4.0.0 Beta7 (32-bit build on Windows 64-bit))
C:\> tiffinfo Shadow_cmyk8.tif
Unknown field with tag 37724 (0x935c) encountered.
TIFF Directory at offset 0x8 (8)
Subfile Type: (0 = 0x0)
Image Width: 768 Image Length: 505
Resolution: 72, 72 pixels/inch
Bits/Sample: 8
Compression Scheme: None
Photometric Interpretation: separated
Extra Samples: 1<assoc-alpha>
Orientation: row 0 top, col 0 lhs
Samples/Pixel: 5
Rows/Strip: 505
Planar Configuration: single image plane
Software: Adobe Photoshop CS3 Windows
DateTime: 2011:10:31 14:09:04
XMLPacket (XMP Metadata):
...
#################################################################### 2) gdalinfo (from current OSGeo4W package)
C:\> gdalinfo Shadow_cmyk8.tif
Warning 1: TIFFReadDirectory:Unknown field with tag 37724 (0x935c) encountered Driver: GTiff/GeoTIFF
Files: Shadow_cmyk8.tif
Size is 768, 505
Coordinate System is `'
Metadata:
TIFFTAG_SOFTWARE=Adobe Photoshop CS3 Windows
TIFFTAG_DATETIME=2011:10:31 14:09:04
TIFFTAG_XRESOLUTION=72
TIFFTAG_YRESOLUTION=72
TIFFTAG_RESOLUTIONUNIT=2 (pixels/inch)
Image Structure Metadata:
SOURCE_COLOR_SPACE=CMYK
INTERLEAVE=PIXEL
Corner Coordinates:
Upper Left ( 0.0, 0.0)
Lower Left ( 0.0, 505.0)
Upper Right ( 768.0, 0.0)
Lower Right ( 768.0, 505.0)
Center ( 384.0, 252.5)
Band 1 Block=768x2 Type=Byte, ColorInterp=Red
Mask Flags: PER_DATASET ALPHA
Band 2 Block=768x2 Type=Byte, ColorInterp=Green
Mask Flags: PER_DATASET ALPHA
Band 3 Block=768x2 Type=Byte, ColorInterp=Blue
Mask Flags: PER_DATASET ALPHA
Band 4 Block=768x2 Type=Byte, ColorInterp=Alpha
####################################################################
3) identify from ImageMagick 6.7.3
C>identify -verbose Shadow_cmyk8.tif
Image: Shadow_cmyk8.tif
Format: TIFF (Tagged Image File Format)
Class: DirectClass
Geometry: 768x505+0+0
Resolution: 72x72
Print size: 10.6667x7.01389
Units: PixelsPerInch
Type: ColorSeparationMatte
Base type: ColorSeparation
Endianess: MSB
Colorspace: CMYK
Depth: 8/16-bit
Channel depth:
cyan: 16-bit
magenta: 16-bit
yellow: 16-bit
black: 8-bit
alpha: 8-bit
Channel statistics:
Cyan:
min: 0 (0)
max: 255 (1)
mean: 30.1219 (0.118125)
standard deviation: 81.5185 (0.31968)
kurtosis: 3.67711
skewness: 2.37807
Magenta:
min: 0 (0)
max: 255 (1)
mean: 69.7906 (0.273689)
standard deviation: 113.31 (0.444351)
kurtosis: -0.984415
skewness: 1.00769
Yellow:
min: 0 (0)
max: 250 (0.980392)
mean: 43.7205 (0.171453)
standard deviation: 89.2673 (0.350068)
kurtosis: 1.31287
skewness: 1.78273
Black:
min: 0 (0)
max: 24 (0.0941176)
mean: 1.10718 (0.00434189)
standard deviation: 4.21034 (0.0165111)
kurtosis: 16.1728
skewness: 4.11968
Alpha:
min: 0 (0)
max: 255 (1)
mean: 46.9553 (0.184138)
standard deviation: 93.2179 (0.36556)
kurtosis: 0.885903
skewness: -1.64831
Image statistics:
Overall:
min: 0 (0)
max: 255 (1)
mean: 70.557 (0.276694)
standard deviation: 85.0415 (0.333496)
kurtosis: 3.04391
skewness: 2.26633
Total ink density: 233%
Alpha: cmyka(0,0,0,0,0) #0000000000
Rendering intent: Undefined
Interlace: None
Background color: cmyka(255,255,255,0,1)
Border color: cmyka(223,223,223,0,1)
Matte color: cmyka(189,189,189,0,1)
Transparent color: cmyka(0,0,0,0,0)
Compose: Over
Page geometry: 768x505+0+0
Dispose: Undefined
Iterations: 0
Compression: None
Orientation: TopLeft
Properties:
...
####################################################################
Which one is right?
How many bits per sample and how many samples per pixel is there?
Best regards,
--
Mateusz Loskot, http://mateusz.loskot.net
Charter Member of OSGeo, http://osgeo.org
Member of ACCU, http://accu.org