https://github.com/CESNET/UltraGrid/discussions/203 10bit display with SDL/GL #203 has this hint (may be not needed on Display port) ==== it is also important to set the display to Full range and set the max bpc ACTIVEDISPLAY=`xrandr | grep " connected " | awk '{ print$1 }'` xrandr --output $ACTIVEDISPLAY --set "Broadcast RGB" "Full" --set "max bpc" 10 https://www.soi.pw/posts/10-bit-color-on-ubuntu-20.04-with-amdgpu-driver/ ==== https://github.com/CESNET/UltraGrid/commit/03b60c9931b1fc83ca91bee09dbe4266f... referred pdf says this: https://www.amd.com/system/files/documents/10-bit-video-output.pdf "Figure 5: 10-bit display feature can be enabled by checking the “Enable 10-bit pixel format support” checkbox in the Catalyst Control Center. Note that this feature is only available in workstation (ATI FireGL™) cards. Once the 10-bit pixel format support is enabled the system will request a reboot and after that any 10- bit aware OpenGL application will be displayed in 10-bits without any clamping. In the following, we demonstrate how an application programmer can easily create a 10-bit aware OpenGL [skip] Creating a 10-bit Texture The previous section highlighted several methods to choose a 10-bit pixel format. It is important to note that once a 10-bit pixel format is chosen any smooth shading operation will immediately take advantage of the increased bit depth. In other words, the user does not need to explicitly provide 10-bit input data to benefit from the increased precision. This is due to the fact the internal processing of colors in the graphics card is in floating-point precision with 10-bit (or 8-bit) conversion occurring only at the output stage. However, it is also possible to explicitly create and work with 10-bit textures as will be explained in this section. 10-bit texture support is exposed to the user through a packed RGB10_A2 texture format, which contains 10 bits for each of the color channels and 2 bits for the alpha component. ==== original issues also should contain test images https://github.com/CESNET/UltraGrid/files/7525556/gradients.zip