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int imagecolorresolvealpha ( resource $image , int $red , int $green , int $blue , int $alpha )

<?php
// Create an image
$im = imagecreatefrompng('tutorialpro-logo.png');

// Get the closest colors from the image
$colors = array();
$colors[] = imagecolorresolvealpha($im, 255, 255, 255, 0);
$colors[] = imagecolorresolvealpha($im, 0, 0, 200, 127);

// Output
print_r($colors);

imagedestroy($im);
?>

Array
(
    [0] => 16777215
    [1] => 2130706632
)