[poppler] pdftops creates huge file with simple color background (attached examples)

[Pierre-Luc Samuel]

Hi poppler team,

I have an issue with pdftops version 0.39.0 with conversion of some 
specific templates to postscript.  I have created very simple use cases 
so that you can understand the issue.

pdftops tux-white.pdf
pdftops tux-yellow.pdf
ls -al *.ps
-rw-r--r-- 1   2816703 Jan 26 11:53 tux-white.ps
-rw-r--r-- 1  27576263 Jan 26 11:53 tux-yellow.ps

The size of the second PS is 27MB, but only the background color has 
changed.  This seems related to the fact that there is an image on the 
template, because if I remove the image, there is no significant size 
difference:

pdftops nothing-white.pdf
pdftops nothing-yellow.pdf
ls -al *.ps
-rw-r--r-- 1     11129 Jan 26 10:34 nothing-white.ps
-rw-r--r-- 1     11167 Jan 26 10:34 nothing-yellow.ps

Is this a known issue?

Thanks!
Pierre-Luc
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