Dithering

[rubikon]

Hello.

I've written a GUI application for Windows CE 6 with Qt 4.7.0 embedded.

The device on which the application runs support 'only' 16 Bit colordepth.

I've noticed that e.g. gradients doesn't look very smooth. The color doesn't 'fade smoothly' into the other, but 'make hard steps'.

I've compared this with the MFC version of my application which I wrote before I switched to Qt. Here this appears to be smoother.

So I've took a closer look and discovered that MFC seems to use a dithering method which look like Floyd-Steinberg algorithm.

How can I achieve this with Qt?

I've attached images of a Qt version and a MFC version (both in original size and 4x zoomed version) of a gradient from #ffffff to #a1a1a1 where the effect can be seen.

Thank you