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# PHP imagecolorclosesthwb - Get the index of the black-and-white color closest in hue to a specified color [PHP Image Processing](#) imagecolorclosesthwb — Get the index of the black-and-white color closest in hue to a specified color. ### Syntax int imagecolorclosesthwb ( resource $image , int $red , int $green , int $blue ) Get the index of the black-and-white color closest in hue to the given color. **Note:** This function requires GD 2.0.1 or higher (version 2.0.28 and above is recommended). ### Parameters * **image** An image resource returned by an image creation function (e.g., imagecreatetruecolor()). * **red** The value of the red component. * **green** The value of the green component. * **blue** The value of the blue component. ### Return Value Returns an integer, the index of the black-and-white color closest in hue to the given color. ### Example The output of the above example is similar to: HWB: 33 ### Related Articles Get the index value of the color closest to a specified color. [PHP Image Processing](#)