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Re: possible png1.5 issue with qt4-libs

On 2 May 2011 18:27, Adam Ciarciński <> wrote:
>>> Not sure if this is a subtle png1.5 issue or something else as I have
>>> limited variants to compare.
>>> Saving a PNG image from KSnapshot or Kolourpaint (kdegraphics4)
>>> currently gives an image with the colour channels shifted R->G->B and
>>> red at 255 everywhere.  I think both of these come back to
>>> QPNGImageWriter::writeImage() from qt4-libs
>>> src/gui/image/qpnghandler.cpp for the actual writing.
>>> Its working correctly on a NetBSD system with png-1.4.5,
>>> qt4-libs-4.7.1nb1, and kde-4.5.4 but failing as above on linux and
>>> NetBSD systems with png-1.5.2, qt4-libs-4.7.2 and kde>=4.5.5
>> We don't have any pkgsrc patches for qt4, I think?
>> Thomas
> From qt4's pixeltool, on Mac OS X, PNGs are saved correctly, while on 
> NetBSD-amd64-current colours are shifted.
> Stellarium, on the other hand, saves images with shifted colours on both Mac 
> OS X and NetBSD.
> Both systems run the latest qt4 and libpng from PkgSrc.
> No, we don't have PNG-related patches for qt4.
Possibly related (or possibly not): just built kde4 on amd64 5.99.51
and the background image while logging in is tinted pink rather than

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