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In need help in converting specific colours (based on hex code or rgba) on an image to Pure Black colour (#000). E.g. Here is a colour page - https://www.dropbox.com/s/2o9clccti6bo7ww/colours.png -> need a script to turn it into -> pure black colour not greyscale -> https://www.dropbox.com/s/oj1cu0gj274oryw/blacknwhite.png
Note the Pink colour should not be converted to black as we have not specified it to change colour to black.