Hello again, I dig a bit deeper and found out that the problem is in X11SurfaceData::X11SD_GetPixmapWithBg.
There is an optimization to only modify pixels if the specified background-color differes from the image-transparent color: if (xsdo->bgPixel != pixel + 1) I found out that the problem only appears if I specify Color.WHITE in drawImage every other color works, I wrote some debug-output: xsdo-bgpixel is now: 0 pixel value is:-1 So it seems Java believes that the transparent-color of the image is white while its balck in reality. If I comment out if (xsdo->bgPixel != pixel + 1) it works as intended as it does when specifying any color !=white. Where is xsdo->bgPixel calculated and how does this strange "pixel" value come from ((255, 255, 255) = -1)? Sorry for asking so much, but the code is quite confusing for a newbie... Thank you in advance, lg Clemens
