(PHP 4 >= 4.0.6, PHP 5)
imagecolorresolvealpha -- Get the index of the specified color + alpha or its closest possible alternativeThis function is guaranteed to return a color index for a requested color, either the exact color or the closest possible alternative.
Bemærk: Denne funktion kræver GD 2.0.1 eller bedre.
See also imagecolorclosestalpha().