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 palette are not resolved.
Returns a color index.
- resource $image: An image resource, returned by one of the image creation functions, such as imagecreatetruecolor().
- int $red: Value of red component.
- int $green: Value of green component.
- int $blue: Value of blue component.
Example #1 Using imagecoloresolve() to get colors from an image
// Load an image
$im = imagecreatefromgif('phplogo.gif');
// Get closest colors from the image
$colors = array();
$colors = imagecolorresolve($im, 255, 255, 255);
$colors = imagecolorresolve($im, 0, 0, 200);
The above example will output something similar to:
Array (  => 89  => 85 )