<?php
declare(strict_types=1);

$image = imagecreatetruecolor(8, 6);
imagesetclip($image, 1, 1, 6, 4);
$red = imagecolorallocate($image, 255, 0, 0);
imagefilledrectangle($image, 0, 0, 7, 5, $red);
imagesetclip($image, 0, 0, imagesx($image) - 1, imagesy($image) - 1);
$pixel = imagecolorsforindex($image, imagecolorat($image, 0, 0));
echo $pixel["red"], ",", $pixel["green"], ",", $pixel["blue"], "\n";
$pixel = imagecolorsforindex($image, imagecolorat($image, 3, 2));
echo $pixel["red"], ",", $pixel["green"], ",", $pixel["blue"], "\n";
