Minor detection performance when using greyscale images

[commanderka]

I have the impression that using greyscale images has a bad impact on the detection performance. I made an experiment: I used an RGB image and found a face, afterwards I converted to greyscale and the detector was no longer able to find a face in this image. In my opinion this behaviour could occur as the detector was trained with more RGB than greyscale images (or images where R=G=B). Could this be the case?