[Scribus] RGB Images & Transparency in PDF 1.4
Fri Apr 29 23:56:10 CEST 2005
The "Adobe Acrobat" section of the "DTP ToolBox" node (under the "Hints for
Scribus Users") of the Scribus documentation (that comes bundled with the
Scribus 1.2.2cvs) says:
"We are aware of one color mismatches with RGB images and transparency in
PDf 1.4. Yes, this has been duly reported as a bug to Adobe too."
Would you elaborate more on it?
Does it imply that embedding non-transparent RGB images in PDF 1.4 will not
Do _indexed_ PNG images also come in the "RGB image" category? Personally, I
suppose not because in common graphics software "indexed" and "RGB" are
treated as two different modes. Please clarify if I am wrong.
Does it imply that exporting a PDF 1.4 with embedded "indexed PNG" (with no
transparency) images won't cause problems?
Somewhere in the same node/section, the documentation says:
"If you are creating Scribus files with transparency effects and export PDF
1.4 (PDF 1.3 does not support transparency), you can enable Show
Transparency Grid. "
Does it mean that exporting PDF 1.3 from Scribus with embedded images,
transparent or otherwise, won't cause problems - considering the text quoted
earlier? Does it also mean that exporting PDF 1.3 with embedded RGB images,
with or without transparency effects, will get rid of the bugs, mentioned in
the text quoted earlier, altogether?
Further, it would be of great help if the bug mentioned in the text quoted
above could also be clearly explained further so that the documentation can
be traced back to the original problem (and the related (original) causes as
well) in addition to correlating the problem with similar problems being
discussed on other mailing lists.
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