ofxCv contrastStretch() not implemented, but invert() etc. working

Hey,

i´m wondering why contrastStretch() from ofxCV is not working, but invert() or blur() for example do…

img.setFromPixels(imgLo.getPixelsRef());
img.contrastStretch();

[warning] ofxCvColorImage: contrastStretch(): not implemented

Any recommondations?

Thanks

Ok, this helped: https://github.com/TsubokuLab/ofxContrast

ofxCv has a function called equalizeHist which is an alternative to contrastStretch I think.