Re: What is the GraphicsMagick equivalent of ImageMagick's +opaque? (graphicsmagick: message 1 of 10)

On Sat, 19 Jan 2019, [email protected] wrote:

> Bob-
>
> Thank you for the prompt response. :)
>
> Sadly, as -channel, -operator and -recolor all work on channels, they did not work in my case.
>
> I want only a specific colour preserved, the rest is deleted. Sortof like an image mask based on a selection by color. This is what +opaque does.

So +opaque is similar to -opaque, but the sense of what gets modified 
is inverted.

There is not much code in the OpaqueImage() implementation and the 
only difference is to invert the sense of a test.

I don't have time to work on this at the moment though.

Bob
-- 
Bob Friesenhahn
[email protected], http://www.simplesystems.org/users/bfriesen/
GraphicsMagick Maintainer,    http://www.GraphicsMagick.org/
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