How can I detemine the presence of some colors (e.g white, light brown, dark brown, red, blue gray and black) in a piture like attached one?

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riya shahrin 2020-2-21

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编辑： riya shahrin 2020-2-22

采纳的回答： Image Analyst

I have to count presence of any colour if its number of pixels is more than 5% of total number of pixels.

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Answer 1

Image Analyst 2020-2-22

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With 16 millino colors possible in a24 bit RGB image, probably no color has that much. You'd be best off defining a limited number, like 5 or 10, color ranges. Then like Daniel said, use the Color Thresholder App to get the area fraction for each color range that you specify.

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riya shahrin 2020-2-22

编辑：riya shahrin 2020-2-22

I was having problem in selecting threshold value for some colours in color thresholder app as they are not exacty visible and separate from other shades. how can I select threshold value for light brown,derk brown and blue grey?

whenever I give a fixed RGB value for a color (e.g rgb(181,101,29) for light brown),number of pixel of that colour become zero.