05-03-1394، 07:45 ب.ظ
<?php
header('Content-type: image/jpeg');
if(!isset($_GET['file']) || !file_exists($_GET['file']) || strtolower(substr($_GET['file'], strrpos($_GET['file'], '.'))) != '.jpg') {
$im = imagecreatetruecolor(100, 100);
$white = imagecolorallocate($im, 255, 255, 255);
$black = imagecolorallocate($im, 0, 0, 0);
imagefill($im, 50, 50, $white);
imagestring($im, 5, 30, 40, 'Error', $black);
imagejpeg($im);
imagedestroy($im);
exit();
}
$file = $_GET['file'];
list($width, $height) = getimagesize($file);
$source = imagecreatefromjpeg($file);
$bwimage = imagecreate($width, $height);
$palette = array();
for ($i = 0; $i < 256; $i++) {
$palette[$i] = imagecolorallocate($bwimage, $i, $i, $i);
}
for($y = 0; $y < $height; $y++) {
for($x = 0; $x < $width; $x++) {
$color = imagecolorat($source, $x, $y);
$r = ($color >> 16) & 0xFF;
$g = ($color >> 8) & 0xFF;
$b = ($color >> 0) & 0xFF;
$gs = ($r * 0.299) + ($g * 0.587) + ($b * 0.114);
imagesetpixel($bwimage, $x, $y, $palette[$gs]);
}
}
imagejpeg($bwimage);
imagedestroy($source);
imagedestroy($bwimage);
?>