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[Savok]

So. In 40d9+, we can have the png alpha channel for use in nice edges. However, I have not found an editor that can do everything that MSpaint does as easily AND work with alpha channels (Paint.NET comes close but not quite). So, if anyone knows of such a program, I'd be delighted. If nobody does, here is the request that somebody create for us:

EDIT3: This is a rather mangled post. Semiscratch EDIT2. And scratch EDIT1. But not so much EDIT0.

EDIT2: Revised my ideas:

A program that sets the new alpha values to the old green (if I have a white-on-magenta image, green is what I want) values and sets the new red, green, and blue values to FF.

Alternatively, a way to do that with any freely available program, like GIMP. That would be wonderful too.

Alternatively, a way to do that with Photoshop CS4.
A program that replaces magenta with alpha. So # WX YZ WX (red green blue) would turn to # YZ YZ YZ WX (red green blue transparent). I personally don't see a need to ever use non-gray colors, so that wouldn't interfere.

Alternatively, a way to do that with any freely available program, like GIMP. That would be wonderful too.

EDIT1: A program that converted grays like # XY XY XY to transparents of # FF FF FF XY would be able to convert most current tilesets and would be as useful for 99% of cases.

[Tormy]

Ah, I just wanted to post about Photoshop, but it's not free....
[I am using Adobe Photoshop CS4..]

[Savok]

It can do that?

[Tormy]

Well, I haven't tried something like this so far, but Photoshop is the best gfx software, so it should be able to do that. 

[Savok]

Oh. Well I'm downloading the trial anyway.

[Janus]

In Photoshop, just open the BMP file, switch to the magic eraser, set "tolerance" to 0 (so it doesn't get nearly-magenta colors), un-check "Contiguous" (so it gets all unconnected bits of magenta wherever they are), then use the tool somewhere in the magenta. All magenta will be erased, leaving transparent.
Then, File->"Save for Web and Devices", and save as PNG-24 for full alpha transparency support (PNG-8 only supports transparency as another color, like GIF does).

[Savok]

Oh, I can do that easily enough with GIMP. I want to turn semi-magenta pixels into semi-transparent pixels.

Or turn greyscale into transparencyscale, so that all pixels are white with varying levels of transparency. For myself, that would be easiest.

For that last one, I basically want to set the alpha channel values to those of another channel (green, for white-on-magenta) and then max all three color channels, so that the image is white, with a lot of transparency.