Qt5 Color Banding

[learc83]

I'm running this demo http://www.youtube.com/watch?v=wulbR2R1GpM on my raspberry pi.

Everything works great at a constant 63 fps. However, the gradients are showing some pretty serious banding, it looks like it's displaying 16 bit color.

Has anyone else noticed this.

(I'm under the impression that if Qt is rendering using OpenGL then changing the framebuffer settings in config.txt won't affect it. I changed them anyway--nothing changed).

[Topguy]

In my experimenting with qmlscene and qml files, I found that using the
"--transparent" option with qmlscene improves the gradients alot.

[yanoscuni]

For raspberry pi I would suggest adding QT_QPA_EGLFS_FORCE888 environment variable (explained here http://doc-snapshot.qt-project.org/qt5-nosubdir/embedded-linux.html). Without this option gradients usually look terrible.