Re: How do I edit the alpha channel?

["Owen" <rcook@xxxxxxxxxxx>]

> I am trying to use GIMP as a sprite creation/editing tool. I'm working
> on recreating an old Macintosh game that my dad was developing in the
> early 90's. The sprites he used were 8-bit color and had separate
> 1-bit masks (black and white). I've converted the images from the
> Macintosh PICT format to PNG and opened them with GIMP, but once I add
> the alpha channel to the sprite image, I have no way of adding the
> black and white mask image to the channel. I've tried everything and
> what documentation I could find on GIMP's site doesn't actually
> mention how to add pixels to the alpha channel.
>
> Without the ability to actually add anything to an alpha channel, the
> feature is useless, so I know that I'm missing something or doing
> something wrong. I really need to merge these files into a single RGBA
> image.
>
> If it matters any, I'm using GIMP in Windows.
>
> Any help would be greatly appreciated.



I am not quite sure what you are doing, but once you get the image
into gimp, save it as an xcf file. That is gimp's native format

Then, working on the xcf file, open the layers dialog

Right click on the layer and you will be able to add alpha channels,
layer masks and do all sorts of operations

After you finish, save it in some usable format, like png


HTH



-- 



Owen