Re: RGB -> RGBA

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Angus Henderson (angus++at++death.reading.sgi.com)
Thu, 23 Mar 1995 09:15:38 +0000

> You can do all this with Paul Haeberli's old image tools, all the stuff
> in ~4Dgifts/.../imgtools.
> Eg. oneband separates images into separate R,G,B,A parts
> cglue joins them together again
> conimg make an image with a constant colour (eg. to be the alpha
> plane).
> saturate you could use this to drive the tree to black and white to
> make the alphe tree outline.
>
> and many others. See ~4Dgifts/.../imgtools/README, you can do amazing things
> with these simple tools.
>
>
>
> Greg E.
>
        and I changed cglue so that you can glue an alpha to an rgb instead of
4 bw's as r,g,b,a. - caglue. and iaglue that makes a two component texture.

There is a whole lot of stuff you can do to textures by combining these tools
along with imgworks and a paintbox, I use them to grab movie loops from films
like Top Gun and to add smooth coastlines to sattelite mapped terrain patches

etc.. etc.. etc..

ANgus

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