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Image-Depth.md

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Image Depth

Usage

Simply specify which pixel bit depth you want to use when starting a session, ie:

xpra start --pixel-depth=30

Support

  • seamless mode (aka xpra start) supports bit depths 16,24 and 30
  • desktop mode (aka start-desktop) supports 8,16,24 and 30
  • the native client xpra attach supports 16,24,30,48

Testing that high bit depth is actually in use can be tricky, for that the xpra toolbox provides a test application.

Limitations

  • the operating system and display must be configured for deep colour support
  • transparency is supported in 24-bit mode, which is in effect a 32-bit mode
  • with versions older than 4.1, 30-bit rendering is only supported in the opengl enabled client, and only the rgb encoding will preserve high bit depth
  • 16-bit mode has no real native encoders and so the pixels are often upsampled to 24-bit before compression which is wasteful
  • 8-bit mode is not optimized at all
  • see also DPI

Feature links