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Like @LBerger said, considering green channel but punishing red and blue might get you there. At least thats what I did for red apples on a green background (which is basically the same here). The concept is explained in this paper: https://lirias.kuleuven.be/bitstream/123456789/546316/3/IPTA2016_submission_camera_ready.pdf Take a look at page 3, point B.
