Editing image colors in PHP - color exchange

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I am trying to convert all colors that are close to black - within a threshold - to completely black. For example, in RGB terms, colors with all components less than 50 become (0,0,0). I know this can be done in GIMP per the link below but does anybody know of a way this can be done in PHP?
Jun 12, 2022 in PHP by narikkadan
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