[Libreoffice-bugs] [Bug 75285] "1-bit colormap" PNG images print as solid black boxes

[bugzilla-daemon at bugs.documentfoundation.org]

https://bugs.documentfoundation.org/show_bug.cgi?id=75285

Thorsten Behrens (CIB) <thb at libreoffice.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         Resolution|---                         |NOTOURBUG
             Status|NEW                         |RESOLVED

--- Comment #27 from Thorsten Behrens (CIB) <thb at libreoffice.org> ---
So after much testing (Linux & Windows), I now believe this is NOTOURBUG.

While in 2018, on an opensuse Leap, I was able to repro, by now (using versions
as old as 5.2.7), I don't see it anymore (neither print to PDF, nor export as
PDF, nor print to CUPS-connected printer and intercepting the spool file shows
the prob).

Versions:
* opensuse Tumbleweed - 20200108
* cups-filters-1.25.0-2.2.x86_64
* libcups2-2.3b6-1.3.x86_64
* libcupsimage2-2.3b6-1.3.x86_64
* cups-2.3b6-1.3.x86_64

This was very likely some bits in the CUPS filter chain meddling with the image
- LibreOffice is passing down:

4 0 obj
<</Type/XObject/Subtype/Image/Width 1230/Height 1230/BitsPerComponent 1/Length
5 0 R
/Filter/CCITTFaxDecode/DecodeParms<</K -1/BlackIs1 true/Columns 1230>>
/ColorSpace/DeviceGray
/Mask 6 0 R

Whereas earlier CUPS output then converted that into:

8 0 obj
<</Subtype/Image
/ColorSpace/DeviceRGB
/Width 1230
/Height 1230
/BitsPerComponent 8
/Filter/DCTDecode/Length 42130>>

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