Adjusting color scale

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Adjusting color scale

Lokart
Hello,

I am having problem to find how to do what seems to be a simple task:
I am working with DEM images, and some have a lot of surface of the same altitude and some high peaks, making the histogram unbalanced. The problem is that the colors are always separated linearly, and I would like to change that for eg exponential. In this manner, I would be able to see more detail in the low altitude areas. I could not find where I could do that.

http://postimg.org/image/6qcp62jr3/

This image is a typical example, where most of the image is blue, you don't see much detail in the blue areas, but you have several other colors displaying the mountainous areas. I would like to change/adjust the "color switch" threshold to have several colors in the lowlands and better see the details.

Any ideas how to do it? Any help is welcome.

Thank you