How to combine two descriptors result

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I am trying to match textures. I used LBP but accuracy is not good when it is about color. So i am trying color descriptor plus texture descriptor together.

For color descriptor, I am just using opencv histogram calchist() and histcompare(). For LBP, i use scikit version.

The question is how to combine this two result to form final result. I tried average of them. Or 30% of calchist + 70% of LBP or 70% of calchist + 30% of LBP.

my question is "how to combine two descriptors result into one result"

Thank you so very much!