Detect color of particular area of image

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Javascript

Python

color

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I'm trying to write code to detect color of particular area of image.

So far I have come across is using opencv, we can do this, But still haven't found any particular tutorial to help with this.

I want to do this with javascript, but I can also use python opencv to get the results.
can anyone please help me with sharing any useful link or can explain how can I achieve detecting color of particular area in image.

What I have tried:

I have tried opencv canny images, though I am successful to get the area seperated with canny images, but how to detect color of that particular pixel area is still a challenge