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possible png1.5 issue with qt4-libs
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
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