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Histogram Comparison: Sensitive to Illumination?

Hi there!

I'm trying to compare the color of two images of an object in two different lightning conditions. I'm using the code from the documentation.

These are the two images I try to compare:

ts_darkgray ts_gray

How come I get really bad correlation for these to images? The code just uses the H and S channels of the image so the value should be ignored, shouldn't it? Using the CV_COMP_CORREL (ranges from -1 to 1) method I get around 0.017. If I take a completely different color image, like making everything red and compare it I get -0.001.

I tried the other methods and combinations of them with equally bad results.

How can I get better results if I just want to compare the color correlation of two images under different lighting conditions?

Thank you!