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What is cv2.inRange used for? What is its syntax suppose to be?

I'm trying to replicate the Magic Wand tool of the Photo Shop

I want to sent a tolerance to my selected ROI in an image, as mentioned in this post.

I found this link, thought it might be useful.

I came across this cv2.inRange but this is the Documentation, I found on inRange.

I have no clue as to what kind of values have to be actually passed into inRange.

What is cv2.inRange used for? What is its syntax suppose to be?

I'm trying to replicate the Magic Wand tool of the Photo Shop

I want to sent a tolerance to my selected ROI in an image, as mentioned in this post.

I found this link, thought it might be useful.

I came across this cv2.inRange but this is the Documentation, I found on inRange.

I have no clue as to what kind of values have to be actually passed into inRange.

If you have any better idea of how to replicate Magic Wand, do share. I posted my idea here