(PHP 4 >= 4.0.6, PHP 5)

imagecolorclosestalpha -- Get the index of the closest color to the specified color + alpha


int imagecolorclosestalpha ( resource image, int red, int green, int blue, int alpha )

Returns the index of the color in the palette of the image which is "closest" to the specified RGB value and alpha level.

Note: This function requires GD 2.0.1 or later.

See also imagecolorexactalpha().