Re: graded alpha channel

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Rob Jenkins (robj++at++quid.csd.sgi.com)
Fri, 29 May 1998 07:56:29 -0700

> 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?
>
> Thanks
>
> Simon.

If you have eoe.sw.imagetools installed then you can use oneband to break any
channel out of and image and cglue to stick any channels together to form an
image. For what you want to do perhaps you could make the greyscale image in
showcase or something ( the 'greyscale' imagetool will make a greyscale also )
in showcase you could make the greyscale go from one corner to another say
though. Once you have the alpha just use cglue with you existing rgb image.

Cheers
Rob

-- 
________________________________________________________________
Rob Jenkins mailto:robj++at++sgi.com
Silicon Graphics, Mtn View, California, USA
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