Re: graded alpha channel

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Angus Dorbie (dorbie++at++sgi.com)
Fri, 29 May 1998 11:58:17 -0700

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Simon M Hart wrote:
>
> Performers
>
> A simple problem in some ways:
>
> [imagefile].rgb + [greyscaleimagefile].rgb = [composite
> imagefile].rgba
>
> That is to say I want to use a greyscale image as the graded alpha
> channel for an rgba image, for instance for putting a graded tint on a
> car window.
>
> Does any one know of an application that is readily available to
> combine two such images to create an rgba file with graded alpha
> channel?
>

Paul Haeberlis tools probably let you do this. There on the Developers
Toolbox but they may also ship with some component of the OS.

I tend to use MultiGen for this type of thing.
In the image editor you can add an alpha channel convert intensity to
alpha, grab the alpha image as a brush load the rgb image add an alpha
channel and paint the alpha information from the brush taken from the
other image.

Or something like that.

Cheers,Angus.

-- 
"Only the mediocre are always at their best." -- Jean Giraudoux 

For advanced 3D graphics Performer + OpenGL based examples and tutors:
http://www.dorbie.com/
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Next message: Prakash Mahesh: "Getting the scene location"
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