This is the typical big-endian problem: green turns to purple. See screenshot from qtdeclarative/examples/quick/imageelements But it doesn't seem to happen in Qt Widget examples such as the chip demo, so maybe it's only on the OpenGL rendering path. However when a shader is used to generate the color directly, as with Rectangle or a custom shader to render a color palette, it's OK. Mesa is doing software rendering ATM on this machine (GPU is a Radeon 9600, ought to be usable for accelerated rendering, but the Xorg Radeon driver is not happy with it for some reason).