[Poppler-bugs] [Bug 22473] Need to handle the Matte entry

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=22473

--- Comment #16 from Thomas Freitag <Thomas.Freitag at alfa.de> ---
(In reply to Albert Astals Cid from comment #15)
> Why do we ignore strDCT ?

Sorry, my mistake: when I started to look deeper in the results of my
regression tests I encountered that I got huge problems with
beamerexample1.pdf, there I got "dancing colors". And I thought that the reason
was that the formula often runs into the clipping of pixels which sometimes
"random" values. I thought that the reason was the usage of this lossy
compression, and ignore this in a first step. After I got all other samples
running I forgot that and upload the patch before thinking again about it....

But today I wasn't no more satisfied with that explanation and searched and
searched what the reason could be, and I was just one step away to give
completely up, but finally I now found the reason: 

In the PDF of comment 13 AND in the beamerexample1.pdf the alpha values were
inverted (Decode [1 0]!!), and instead of use this for the matte color I have
to correct the alpha value in the formula!

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