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October 2008
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2008.10.23 19:56 "Re: JPEGSetupEncode messages", by Jeffrey Ratcliffe
2008/10/23 Gerben Vos <Gerben@zylab.com>: >> JPEGSetupEncode: RowsPerStrip must be multiple of 8 for JPEG > > Add the "-r 8" option to tiffcp. Or 16, or 24, or... > >> JPEGSetupEncode: BitsPerSample 16 not allowed for JPEG > > Reduce it to 8 bits (or compile a 12 bits version of libjpeg and link > it to libtiff, then reduce your image to 12 bits and rest assured in > the knowledge that almost no-one will be able to decode it). Thanks for this, and all the other help. I now have things working for this one case, which leads me to more questions: Is there any way of telling at runtime from the command line (or with perlmagick) whether libjpeg is compiled for 8 or 12 bit? Or can I safely assume that it is 8 bit? Presumably this is 8 bits per channel, so for 3 channels, 24 bits? Sometimes RowsPerStrip must be a multiple of 8 for JPEG, and sometimes 16. How can I tell which will be necessary? Regards Jeff