Oh, that's what I was afraid of... Well, thanks!
Just one more question: I have no problem in defining my mountains as just black and white, instead of black and gray, would that make any difference at all? My map will have to be in grayscale, it will be printed later on.
You should have the same problem: white should be completely transparent.
I just tried the technique I suggested, and it doesn't work unless the two brushes are exactly the same size. I'm not sure where I went wrong defining them, but they were a couple of pixels off, so the first mountain was perfect, and each one thereafter was just a little bit more wrong. Probably more work than it's really worth.
What's frustrating is that this is one of those things that Gimp does fairly easily. I don't know why Adobe can't manage to implement features that an open source product contains. Or maybe this is just their way of trying to get people to also buy Illustrator, in which it's as easy as dragging your shape to the swatches panel.
Bryan Ray, visual effects artist
http://www.bryanray.name
Ok, I downloaded GIMP and I am willing to compromise... I will draw the entire map in Photoshop and then I open it with GIMP and fill in the mountains! Not the best solution but it will work nonetheless... So, how do I avoid overlapping in GIMP? I created a mountain brush with white background and added it as a brush but I am having the same problem as before.
If I am understanding correctly, your brush where you want the mountain shape to be has to be "filled" with solid color. About the only transparency you should have is the background and any lines for the shape of the mountains where you have blurred (either manually or via fuzy brush to anti-alias.
My Finished Maps
Works in Progress(or abandoned tests)
My Tutorials:
Explanation of Layer Masks in GIMP
How to create ISO Mountains in GIMP/PS using the Smudge tool
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Unless otherwise stated by me in the post, all work is licensed under a Creative Commons Attribution-Noncommercial 3.0 United States License.
I am not a Gimp user, so I can't give you any concrete guidance, but I believe the feature you need is called an image hose.
Bryan Ray, visual effects artist
http://www.bryanray.name
Thank you everyone for the advices! I was able to solve the problem using GIMP, creating an external image with solid colors and then importing it as a brush... I tried the same procedure in Photoshop and it didn't work, but I don't see any major problem in using both programs, so I guess that is it!
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