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Geek Culture / Need help with gimp and alpha channels.

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coolgames
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Location: Oregon, USA
Posted: 29th Jun 2006 18:02
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I want to create a texture in gimp that has an alpha channel to be used in 3dws. My image has a black background, I only want the black background to be transparent. Is there a way to do this. I have only succeded in making the whole image transparent.

Thanks.

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Oddmind
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Location: Atlanta, Georgia
Posted: 29th Jun 2006 22:35
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ive never done alpha in 3dws but im guessing the the transparent image "new layer, delete the background" and paint on that.

formerly KrazyJimmy

I'm the lizard king, I can do anything.
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Jess T
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Posted: 30th Jun 2006 06:16 Edited at: 30th Jun 2006 06:16
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If the layer you're trying to make transparent is called "Background", you have to copy it to a new one, since the "Background" layer doesn't have any transparency.

And, yes, there is a way to do what you're after.

Go to Filters >> Colours >> Colour To Alpha

Where it says "From [big block of colour here] to Alpha", click on the big block of colour to change it to Black, hit "OK" then you're done

Jess.

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coolgames
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Posted: 30th Jun 2006 17:45
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I used the color to alpha, but it made the entire texture partially transparent. Instead I used a tool to select only the texture and not the black, I copied it and pasted onto an entirly transparent layer. It worked! Thanks for the background tip, helped a lot.

Play my game "Hang Glider"! http://forum.thegamecreators.com/?m=forum_view&t=70854&b=8
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Flindiana Jones
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Posted: 30th Jun 2006 18:01
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Thanks for the help, I was wondering about that also...

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Jess T
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Posted: 1st Jul 2006 05:22
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No worries.

Yeah, that is a side-effect of using that tool, so a little discipline is needed.

One trick I use, is I magic select all the area's I need to take the colour out of, then 'Grow' the selection by 1px (so it slightly intrudes on the adjacent pixels) then use the Colour to Alpha tool. That way, if there's any AA on the image, it quite nicely makes it AA into Transparency rather than into the left-overs of the colour, then a hard cut into transparency

GIMP is quite different to use than other popular image tools, but once you get the basics down, and learn some techniques, you'll never go back to the others

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