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

July 22, 2010 | 4:18 am

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


July 22, 2010 | 11:14 am

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


July 22, 2010 | 11:40 pm

thanks


July 23, 2010 | 2:41 am

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??


July 24, 2010 | 10:27 pm

maybe this? using jit.rgb2luma:

– Pasted Max Patch, click to expand. –

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