How can I make greyscale (brightness value) to alpha value?

Jul 22, 2010 at 4:18am

How can I make greyscale (brightness value) to alpha value?

Hello.

I am trying to make a jitter grayscale input (rgb2luma) to alpha value that is white(visible)–>black(invisible).
The grey steps should be calculated into alpha value.
any ideas?

thank you

#51454
Jul 22, 2010 at 11:14am

You could try the Auvi object au.addalpha –
download Auvi at http://www.auvi-software.com

#184479
Jul 22, 2010 at 11:40pm

thanks

#184480
Jul 23, 2010 at 2:41am

hmm..
no luck yet, just smoothing edge of lumakey is the way I found.

Is there any way really calculate grayscale’s each pixel value and convert it to alpha value??

#184481
Jul 24, 2010 at 10:27pm

maybe this? using jit.rgb2luma:

– Pasted Max Patch, click to expand. –
#184482

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