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January 2014

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2 discussions

pdflatex includegraphics eats newline of stream
by Florian Breitwieser 10 Jan '14

10 Jan '14

Hi! pdftex is eating the last new-lines in streams included with includegraphics, when the stream has an extra new-line. Toy example; an object in the PDF image looks like this: 15 0 obj <</Length 6>>stream ABCDF endstream endobj [there are just new-lines at the end of ABCDF and in the next line]. When I include this PDF with includegraphics, the last new-line disappears, but the stream Length count does not get updated (or touched at all, as far as I can tell): 15 0 obj <</Length 6>>stream ABCDF endstream endobj This produces an error when trying to get PDF/A compliance, which is strict about stream lengths. Best, Florian

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Re: [NTG-pdftex] [tlbuild] writepng.c: No transparency with PDF/A-1b
by Martin Schröder 07 Jan '14

07 Jan '14

2014/1/7 Florian Breitwieser <florian.bw(a)gmail.com>: > I am trying to create PDF/A-1b compliant documents with (pdf)LaTeX. > PDF/A-1 is based on PDF v4, however unlike the former it does not > allow transparency (and is very strict about all its rules). > > ./texk/web2c/pdftexdir/writepng.c only writes the alpha channel when > pdfminorversion is >= 4, and excludes it otherwise. Eg in line 523: > > /* alpha channel support */ > if (fixedpdfminorversion < 4 > && png_get_color_type(png_ptr(img), png_info(img)) | > PNG_COLOR_MASK_ALPHA) { > png_set_strip_alpha(png_ptr(img)); > png_copy = false; > } > > Would it be feasible to add a 'notransparency' or 'pdfa1' flag to > generate a no-transparency PDF 4 document? AFAIK it's based on 1.3 (the main addition of 1.4 is transparency), so can't you just set pdfminorversion to 3? Best Martin PS: Crossposted to the pdftex-devel list

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