Usage

Starting with version 2.0, you can simply specify which pixel bit depth you want to use when starting a session:

xpra start --pixel-depth=30

The "start" command supports bit depths 16,24 and 30. The "start-desktop" command supports 8,16,24 and 30.

Note: transparency is supported in 24-bit mode, which is in effect a 32-bit mode.

Limitations

30-bit rendering is only supported in the opengl enabled client (the operating system and display must be configured for deep colour support), with opengl disabled the data will always be downsampled
only the "rgb" encoding will preserve high bit depth at present
the other encodings will downsample 30-bit to 24-bit before compression
16-bit mode has no native encoders and so the pixels are upsampled to 24-bit before compression which is wasteful
8-bit mode is not optimized

Codec support for 10 bit per pixel (aka 30 bit):