1 <?php
2 /**
3 * Date: 2016/10/24
4 * Time: 0:52
5 */
6 // Gray = (R^2.2 * 0.2973 + G^2.2 * 0.6274 + B^2.2 * 0.0753)^(1/2.2)
7 $size = getimagesize('png.png');
8 $res = imagecreatefrompng('png.png');
9 for ($i = 0; $i < $size[1]; ++$i) {
10 for ($j = 0; $j < $size[0]; ++$j) {
11 $rgb = imagecolorat($res, $j, $i);
12 // var_dump($rgb);
13 $rgbarray = imagecolorsforindex($res, $rgb);
14 print_r($rgbarray);
15 $wr = $rgbarray['red'];
16 $wg = $rgbarray['green'];
17 $wb = $rgbarray['blue'];
18 $gray = ($wr ^ 2.2 * 0.2973 + $wg ^ 2.2 * 0.6274 + $wb ^ 2.2 * 0.0753) ^ (1 / 2.2);
19 echo $gray, '<br>';
20
21 //???
22 if ($rgbarray['red'] < 125 || $rgbarray['green'] < 125 ||
23 $rgbarray['blue'] < 125
24 ) {
25 $data[$i][$j] = 1;
26 } else {
27 $data[$i][$j] = 0;
28 }
29
30 }
31 }
