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Alright, I figured it out with the help of a colleague:

parallel_for_(Range(0,w), Parallel_markMax(img, img_col),6);

You can pass an aditional parameter that controls the size of the individual tasks.

Alright, I figured it out with the help of a colleague:

parallel_for_(Range(0,w), Parallel_markMax(img, img_col),6);
img_col),12);

You can pass an aditional parameter that controls the size of the individual tasks. In this case, I create each two threads for six of my eight cores. Two cores are normally used for other stuff, so I don't have to wait for the two last threads to finish when the other six are much faster.