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February 2012
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2012.02.22 08:22 "Creating a CMYK tiff", by Dan Claudiu Zaharescu
Hello all, The problem was posted before, about 10 years ago, but there were no satisfying answer for it: 2002.08.01 05:39 "Tiff AND CMYK", by <storein@sina.com> I am now trying to do the same thing, but I am facing some difficulties: Here is some relevant code, and I have bolded the most important calls: TIFFSetField(image, TIFFTAG_SAMPLESPERPIXEL, 4); /* When I use separate plans, the tiff cannot be opened, but I don't think contig is good here!! */ //TIFFSetField(image, TIFFTAG_PLANARCONFIG, PLANARCONFIG_SEPARATE); TIFFSetField(image, TIFFTAG_PLANARCONFIG, PLANARCONFIG_CONTIG); // We need to set some values for basic tags before we can add any data TIFFSetField(image, TIFFTAG_IMAGEWIDTH, width); TIFFSetField(image, TIFFTAG_IMAGELENGTH, height); TIFFSetField(image, TIFFTAG_BITSPERSAMPLE, 8); TIFFSetField(image, TIFFTAG_ROWSPERSTRIP, height); TIFFSetField(image, TIFFTAG_FILLORDER, FILLORDER_MSB2LSB); /*I use lzw data, but I think this is not very relevant */ TIFFSetField(image, TIFFTAG_COMPRESSION, COMPRESSION_LZW); TIFFSetField(image, TIFFTAG_XRESOLUTION, 600.0); TIFFSetField(image, TIFFTAG_YRESOLUTION, 600.0); TIFFSetField(image, TIFFTAG_RESOLUTIONUNIT, RESUNIT_INCH); Now, I have 4 buffers of LZW data: For each buffer, I try to call: TIFFWriteRawStrip(image, 0, buff, buffLen); Is it ok to call the method this way? Should I pass to the second paramter the number of the buffer (0,1,2 and 3)? However the results are disappointing, I am obtaining a tiff with many duplicated images and these images are not colored as they should be. Some further remarks: "Tag may not have its values changed once data is written. If SamplesPerPixel is one, then a single array is passed; otherwise three arrays should be passed." - this is written in TIFFSetField manual : http://www.libtiff.org/man/TIFFSetField.3t.html What fields should I se 4 times and how? I have tried more combination as described above, but could not make it work in any way. Does anybody now how these issue should be handled? I will further investigate myself this issue and come back again with a new mail if I will find a solution. All the bests, Dan.