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April 2009
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2009.04.29 16:07 "Re: Libtiff and OpenCV", by Bob Friesenhahn
On Wed, 29 Apr 2009, Kai-Uwe Behrmann wrote: > Am 28.04.09, 20:15 +0200 schrieb Andreas H.: >> is an 8-Bit grayscale tif. >> >> andreas@host:$ identify real_604.tif >> real_604.tif TIFF 1392x1024 1392x1024+0+0 PseudoClass 256c 8-bit >> 120.99kb > > PseudoClass 256c seems <-> grayscale tif > You should not miss to set the photometric interpretation > TIFFTAG_PHOTOMETRIC with TIFFSetField to PHOTOMETRIC_MINISBLACK. I seem to have missed the original email. ImageMagick's identify is not a very useful tool to evaluate TIFF subformats since ImageMagick automatically promotes single channel images to colormapped (PseudoClass) with a grayscale colormap ramp. This means that MINISWHITE and MINISBLACK images will be called PseudoClass. Use libtiff's 'tiffinfo' to obtain more accurate information. Bob -- Bob Friesenhahn bfriesen@simple.dallas.tx.us, http://www.simplesystems.org/users/bfriesen/ GraphicsMagick Maintainer, http://www.GraphicsMagick.org/