<?php
$im = ImageCreateFromJpeg
("file.jpg");
$size = getimagesize("file.jpg");
$new = imagecreate($size[0], $size
[1]);
$black = imagecolorallocate($new, 0,
0, 0);
$white = imagecolorallocate($new,
0xFF, 0xFF, 0xFF);
for ($i = 1; $i < $size[0]; $i++) {
for ($j = 1; $j < $size[1]; $j++) {
$rgb = ImageColorAt($im, $i, $j);
$r = ($rgb >> 16) & 0xFF;
$g = ($rgb >> 8) & 0xFF;
$b = $rgb & 0xFF;
if ( $r < 128 && $r < 128 && $b <
128 ) {
imagesetpixel($new, $i, $j, $black);
} elseif ( $r >= 128 && $r >= 128 &&
$b >= 128 ) {
imagesetpixel($new, $i, $j, $white);
}
}
}
header("Content-type: image/jpeg");
imagejpeg($new, null, 100);
imagedestroy($im);
imagedestroy($new);
?>

Добавил: tucha_32

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