Feature Requests item #4348, was opened at 2012-04-04 16:30 Status: Open Priority: 3 Submitted By: Christian Feuersaenger (ludewich) Assigned to: Nobody (None) Summary: Support custom /Filter for pdf data streams Category: PDF generation Group: None Resolution: None Initial Comment: Hi, while working with binary streams in pdftex/luatex I encountered a problem with /Filter : if I provide a /Filter argument for my stream (I wanted to use base 64) and \pdfcompresslevel>0, pdftex will overwrite my filter. The result looks like 4 0 obj << /ShadingType 5 /BitsPerCoordinate 24 /BitsPerComponent 16 /VerticesPerRow 25 /ColorSpace /DeviceRGB/Decode [-16383.999992 16384 -16383.999992 16384 0 1] /Function << /FunctionType 3 /Domain [0 1] /Functions [ << /FunctionType 2 /Domain [0 1] /C0 [0 0 1] /C1 [1 1 0] /N 1 >> << /FunctionType 2 /Domain [0 1] /C0 [1 1 0] /C1 [1 0.5 0] /N 1 >> << /FunctionType 2 /Domain [0 1] /C0 [1 0.5 0] /C1 [1 0 0] /N 1 >> ] /Bounds [ 0.33333 0.66666] /Encode [ 0 1 0 1 0 1] >> /Filter /ASCIIHexDecode /Length 4822 /Filter /FlateDecode

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which results in a complete loss of data because my own /Filter argument is ignored; the file is corrupted. To correct the file, I have to enter /Filter [/FlateDecode /ASCIIHexDecode] FEATURE REQUEST: I believe it would be cool if pdftex would scan the attributes for a /Filter argument and insert its compression filter as first filter. WORK-AROUND: set \pdfcompresslevel=0 before generating the pdf stream object containing a custom filter. This happens with pdftex -version pdfTeX 3.1415926-2.3-1.40.12 (TeX Live 2011) kpathsea version 6.0.1 Copyright 2011 Peter Breitenlohner (eTeX)/Han The Thanh (pdfTeX). There is NO warranty. Redistribution of this software is covered by the terms of both the pdfTeX copyright and the Lesser GNU General Public License. For more information about these matters, see the file named COPYING and the pdfTeX source. Primary author of pdfTeX: Peter Breitenlohner (eTeX)/Han The Thanh (pdfTeX). Compiled with libpng 1.5.2; using libpng 1.5.2 Compiled with zlib 1.2.5; using zlib 1.2.5 Compiled with xpdf version 3.02pl5 I generated the pdf with \immediate\pdfobj stream attr {% % stream length will be computed automatically /ShadingType \pgfplotslibrarysurf@type\space /BitsPerCoordinate \pgfplotslibrarysurf@bitspercoordinate\space /BitsPerComponent 16 \if5\pgfplotslibrarysurf@type /VerticesPerRow \pgfkeysvalueof{/pgfplots/surf shading/cols} \else /BitsPerFlag 8 \fi /ColorSpace /Device\pgfplotslibrarysurf@colorspace /Decode [\pgfplotslibrarysurf@decode] /Function \pgfkeysvalueof{/pgfplots/surf shading/colormap} \ifx\pgfplotslibrarysurf@filter@decode\pgfutil@empty \else /Filter /\pgfplotslibrarysurf@filter@decode\space \fi } {% \pgfplotslibrarysurf@binarystream }% I attached the offending (corrupt) pdf file. ---------------------------------------------------------------------- You can respond by visiting: http://sarovar.org/tracker/?func=detail&atid=496&aid=4348&group_id=106