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VIP Alpha Blending Mixer and transparent color?

Honored Contributor II


I use Terasik DE2-115 FPGA Cyclon IV board (Quartus 11.1) 

I'm trying to use the VIP Core Alpha Blending Mixer based on tPad_VIP example from Terasic. 

Layer 0 is a plain black background. Layer1 are clocked video input and layer2 are text overlay. 

Text layer1 superimposed on a layer2 of the video stream without Alpha Blending. 

All is well, but the text layer background is not transparent and closes the video stream.  

Can I set the transparent color text layer?  

I need to display text and graphic information over the video stream on a transparent layer. 

Or it is necessary to use Alpha Blending? 

Thank you.
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