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November 2011
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2011.11.30 11:23 "Inconsistent metadata report for CMYK 8-bit image", by <mateusz@loskot.net>
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