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unxnut's suggestions is probably the right way to go at this, but I found a quick hack that gets me mostly what I want:

To stretch an image so the topmost few pixels are clipped:

• cvErode srcImage n times --> erodedImg // this will remove all the highest localized peaks
• cvMinMaxLoc erodedImg // this will get the maximum value
• Scale srcImg * (255.0 / maxValue) // this will set the maximum value of the eroded image to 255 and clip all higher values

removing low peaks works the same, but was not needed in my case