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There isn't any particular single exact correct way to accomplish your goal, which is why it's difficult to help you with the questions you're asking. We can't give you code like you're asking for....

That's why you also have to fill in the blanks. Say your noise creates this:


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You'd have to fill in the blanks to create something more...

When I say scale, I mean you need to scale the data, not the image. The idea is the same though. You're going to have to write some code that takes the noise as input and outputs an array with...

You have to think about your problem a little more. You haven't posted an SSCCE including the logic that takes these numbers and uses them as drawing coordinates, so it's rather hard to be more...

If you change the difference in height, you're going to change the gradient. You have to adjust your x-scale as well to smooth the gradient out a bit.