compress hue range of an image

[bugblatterbeast]

@Ofnuts: That is exactly what i wanted right now and even better. I didn't realize that my hue range was going from around 270 through zero to about 180. So just doing a division as I had in mind would have led to an undesirable result (edit: shift before operation would have been necessary).

@rich2005: Thank you very much for that hint. I am not using any fancy distribution, just boring Ubuntu with xfce (I'm lazy). G'MIC is available and seems highly interesting. I'll sure look into it in the future.

Issue is solved.

Thanks and regards!