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|Author:||Axelgirl [ 12 Jan 2009, 23:19 ]|
|Post subject:||Alpha channel|
I've got a problem with alpha cannel. I have a video and i would use it like an alpha mask but the only block i found is "alpha blend" that works only with images.
|Author:||alessandro [ 22 Jan 2009, 03:59 ]|
|Post subject:||Re: Alpha channel|
currently the block operating on alpha channels are :
Attached to this replay you find a tutorial patch named "AlphaMask3DDisplay.eywx" explaining all the operation needed to make an alpha masked video using the tridimensional catalog blocks.
With the second way the masking is done by the CPU and the result is an eyesweb image (you can display and save as bitmap or video file).
Attached to this replay you find another tutorial patch named "AlphaMaskPIP.eywx" explaining all the operation needed to make an alpha masked video using the PictureInPicture block.
The ExtractChannel and ComposeChannels blocks are ignored because the PictureInPicture and ImageSetAlpha block perform the same operation (only on alpha channel) in a optimized way.
Only a note : The first solution (ImageSetAlpha and block of tridimensional catalog) transfer a lot of data between CPU and GPU. The second solution (PictureInPicture) make heavy computations on the images. So, if you want to process in realtime high resolution video, a PC system with very high computational power is required. If you do not want to make realtime processing, or you use low resolution video, a PC with medium computational power is able to do this work.
Feel free to make any other questions,
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