hmm. this IS a hard one. I think it would be pretty hard to inffluence the algo itself. so, I think some post or preproccessig would be in order. One method would be to simply scale up your 400x400 to 1024 with smoothing. white pixels would be grey 128,128,128. the perlin mapping would generate values from 0 to 128 and add that directly to the thing produced before. Of course, to make it differentiate less, lower the color value of land, and make the perlin mapping generate from 0 to (256-land value).
Perlin Noise influence
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