(PHP 4, PHP 5, PHP 7)
Get the index of the specified color
int imagecolorexact ( resource $image, int $red, int $green, int $blue )
Returns the index of the specified color in the palette of the image.
If you created the image from a file, only colors used in the image are resolved. Colors present only in the palette are not resolved.
Parameters:
image
An image resource, r