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# PHP imagecolorexact - Get the Index Value of a Specified Color [PHP Image Processing](#) imagecolorexact — Get the index value of a specified color. ### Syntax int imagecolorexact ( resource $image , int $red , int $green , int $blue ) Returns the index value of the specified color in the image's palette. If the color is not in the image's palette, returns -1. If the image was created from a file, only colors used in the image will be resolved. Colors that only appear in the palette will not be resolved. ### Related Articles Get the index value of the color closest to the specified color. [PHP Image Processing](#)