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I've already had to do this. In building up various attributes of a
height field, I used Paint Shop Pro. I have version 4.12 and it will
perform image arithmetic including Add, Subtract, Multiply, Divide,
Minimum, Maximum. Filters also allow for other effects. I have used the
Soften image filter to remove height steps and then added it to a
"gravel" height field for the final.
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