Compare a single column table with a reference table.

Hi there,
I want to check the similarity of an image with a reference image set. I have already developed the tables with RGB values for the reference image set. Now I want to compare the RGB value table of the sample image with the reference table. Can you help me to get a similarity percentage? What I wanted is to identify two varieties by it’s color.
Thank you.

My suggestion is to use the Table Difference finder node(Table Difference Finder – KNIME Community Hub) and then a math formula node to calculate the %similarity

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I tried this one, But haven’t got a good result.