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April 2012
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2012.04.11 12:20 "Re: tiff2pdf fit image to page - how does it scale?", by David E Meier
> Am Mittwoch, den 11.04.2012, 11:48 +0200 schrieb David E. Meier: >> If I calculate the size of an A4 page with 1728 pixels width it would >> give >> me 2444 pixels in height, thus, larger than the image that is getting >> cropped. >> >> Can anyone shine a little light on this matter? Thanks, > > Looking into pdf2tiff.c I see a function tiff2pdf_match_papersize and > its static list entry for A4 is width:595 x height:842. For 1728 pixels > width this would result in a (scaled up) default of 2445 pixels. > > Specifying -p sets an internal flag "pdf_overridepagesize" which later > on results in the pdf_pagewidth and pdf_pageheight values, i.e. the ones > written into the PDF, to be plain copies of the defaulted page width and > height. If you want the actual TIFF width and height in the PDF, I guess > you could just specify the DPI and leave the paper size alone? Thank you Jürgen. I followed your suggestion and am omitting the -p flag now. This produces PDFs with everything on the page but they are not A4 anymore which leaves the scaling to the printer driver... I also realized tiff2pdf "stretches" the pages according to the vertical resolution which does not need to be the same as the horizontal value. However, I think this is an unexpected behavior of tiff2pdf. In my opinion it should scale instead of crop the image to the page size if specified - or provide an additional flag to do so. David. _______________________________________________ Tiff mailing list: Tiff@lists.maptools.org http://lists.maptools.org/mailman/listinfo/tiff http://www.remotesensing.org/libtiff/