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LogiCORE IP Video On Screen Display (OSD) - Why does the background change to another color when a GPU layer is enabled?
Why does the background change to another color when a GPU layer is enabled?
For example, why does the background change from black to grey when the GPU layer is enabled?
This can happen for a number of reasons.
Please see (Xilinx Answer 33257) for a detailed list of LogiCORE IP Video On Screen Display Release Notes and Known Issues.
- Make sure that the global alpha enable bit for the graphics layer is disabled, which is bit 1 of address 0x110, 0x120, 0x130, etc.
It should not be set if that layer is a graphics controller.
- The first entry in the color table should always be 0x00000000.
This ensures that the background of the graphics layer has an alpha value of 0x00 and should not blend.