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Make alpha dependent on RGB

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Make alpha dependent on RGB
Helios Offline
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Posts: 3
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Gimp version: 2.10
#3
10-10-2020, 09:36 AM (This post was last modified: 10-10-2020, 09:49 AM by Helios.)
Well right now its simple full opacity. I have yet to create proper alpha, but thats what i need, base it on RG channels.
(10-10-2020, 09:26 AM)rich2005 Wrote:
Quote:What i want to do is to edit alpha channel as a curve, but based on Red and Green channel
Is this possible ?  An alpha channel is just a greyscale mask, nothing in there to adjust red or green ?

I have green channel 0-100. I want my alpha to be 0-50, 50 where green is 100, alpha 25 where green is 50...etc etc. Or even non linear - curve
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Messages In This Thread
Make alpha dependent on RGB - by Helios - 10-10-2020, 09:16 AM
RE: Make alpha dependent on RGB - by rich2005 - 10-10-2020, 09:26 AM
RE: Make alpha dependent on RGB - by Helios - 10-10-2020, 09:36 AM
RE: Make alpha dependent on RGB - by rich2005 - 10-10-2020, 10:24 AM
RE: Make alpha dependent on RGB - by Helios - 10-10-2020, 11:00 AM

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