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int imagecolorat ( resource $image , int $x , int $y )

<?php
$im = ImageCreateFromPng("tutorialpro-logo.png");
$rgb = ImageColorAt($im, 100, 25);
$r = ($rgb >> 16) & 0xFF;
$g = ($rgb >> 8) & 0xFF;
$b = $rgb & 0xFF;
?>