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In my knowledge Histogram Calculation may help you, where you can calculate histogram of each channel of your image. But it will consider the entire image for pixel count and you cannot consider an isolated area as your target area. If you want to do so threshold the image with your each colour range and find the area of thresholded contour.

In my knowledge Sometimes Histogram Calculation may help you, where you can calculate histogram of each channel of your image. But it will consider the entire image for pixel count and you cannot consider an isolated area as your target area. If you want to do so threshold the image with your each colour range and find the area of thresholded contour.

Sometimes Histogram Calculation help you, where you can calculate histogram of each channel of your image. But it will consider the entire image for pixel count and you cannot consider an isolated area as your target area. If you want to do so your target is an isolated area threshold the image with your each colour range and find the area of thresholded contour.