https://bugs.freedesktop.org/show_bug.cgi?id=44135

--- Comment #36 from stfhell <[email protected]> ---
Created attachment 71283
  --> https://bugs.freedesktop.org/attachment.cgi?id=71283&action=edit
export2pdf_transparency_colors_PDFStreams.zip

I'm attaching a ZIP with a readable form of the PDF streams plus screenshots
from Acrobat X PDF preflights. Acrobat preflight considers both PDFs as
correct.

The attached PDF stream files just omit the binary encoded streams. The stream
for object 2 is added in decoded form, object streams 4 and 6 are identical in
both files.

The difference in size of the PDFs will be due to the fonts that are embedded
(which are different). But I think it's interesting that the "new-style" PDF
export creates separate transparency groups for objects 4 and 6 (the yellow and
red forms):
  /Group<</S/Transparency/CS/DeviceRGB/K true>>
That is also shown in the Acrobat screenshots.
The "old-style" PDF-export put everything in a single transparency group in
object 1 and didn't define groups for objects 4 and 6.
Note that Okular only renders these 2 objects as greyscale (not the blue one).

One way to check where the problem lies (the PDF export filter or the PDF
viewers) would be to check if the "greyscale PDF viewers" also have problems
with multiple transparency group PDFs created by other PDF writers than LO or
OO.

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