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October 2008
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2008.10.22 23:31 "Re: JPEGSetupEncode messages", by <lemoine.raphael@gmail.com>
Hello, On Oct 23, 2008, at 1:16 AM, Frank Warmerdam wrote: > Jeffrey Ratcliffe wrote: >> I have tiff output from a scanner with which I would like use >> libtiff's jpeg compression via tiffcp. For a greyscale scan, however, >> I am getting: >> JPEGSetupEncode: RowsPerStrip must be multiple of 8 for JPEG > > Jeff, > > I would suggest selecting a RowsPerStrip value that is a multiple > of 8. > >> and for colour scans: >> JPEGSetupEncode: BitsPerSample 16 not allowed for JPEG >> What can I do to make this work? > > It is quite challenging to manage 16bit data with JPEG compression. > How badly do you want to do this? > AFAIK, there is no such thing as 16-bits per channels in the JPEG standard (only 8 and 12 bits are allowed). With the IJG library, this can only be selected at compile time... Best regards, Raphael > Best regards, > -- > --------------------------------------- > +-------------------------------------- > I set the clouds in motion - turn up | Frank Warmerdam, warmerdam@pobox.com > light and sound - activate the windows | http://pobox.com/~warmerdam > and watch the world go round - Rush | Geospatial Programmer for > Rent > > _______________________________________________ > Tiff mailing list: Tiff@lists.maptools.org > http://lists.maptools.org/mailman/listinfo/tiff > http://www.remotesensing.org/libtiff/