imagecolorresolve

(PHP 4, PHP 5)

imagecolorresolve — Get the index of the specified color or its closest possible alternative

int imagecolorresolve ( resource $image , int $red , int $green , int $blue )

This function is guaranteed to return a color index for a requested color, either the exact color or the closest possible alternative.

If you created the image from a file, only colors used in the image are resolved. Colors present only in the pallete are not resolved.

image: An image resource, returned by one of the image creation functions, such as imagecreatetruecolor().
red: Value of red component
green: Value of green component
blue: Value of blue component

Returns a color index.