My basic icon rule is, I do all of the visual adjustment on the large size image first. If I think it is ready, and it is all layers, I export it to png at the same size first.
Then create a blank 100 x 100 75dpi transparent new image. Select either whole or part of the large image I want, copy it and paste into the new 100 x 100 image I'd created. Then in the Layer menu, I choose 'Scale Layer' to re-size my pasted image until it is at the size I want, and the way I want. Always make sure your Interpolation is Sinc Lanczos3.
A lot of steps, but it usually works for me. I'm not very good with text, though. :(
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As for tutorials, I know there are a huge PILE of them over at LJ.
My basic icon rule is, I do all of the visual adjustment on the large size image first. If I think it is ready, and it is all layers, I export it to png at the same size first.
Then create a blank 100 x 100 75dpi transparent new image. Select either whole or part of the large image I want, copy it and paste into the new 100 x 100 image I'd created. Then in the Layer menu, I choose 'Scale Layer' to re-size my pasted image until it is at the size I want, and the way I want. Always make sure your Interpolation is Sinc Lanczos3.
A lot of steps, but it usually works for me. I'm not very good with text, though. :(