title: How to convert only yellow colour in an image to black using opencv?
body: <p>I want to convert a image of a yellow chess board on a wall to a black and white image in which all yellow(or any shades of yellow) portions gets converted to black and I may get a perfect chessboard image to use findchessboardcorners() function in opencv.Even though it works fine with gray scale image but I want to make findchessboardcorners() function work faster as it works with true black and white images.Please can anyone suggest a method to do so in opencv.</p>