function _imageapi_gd_pixel_grayscale in ImageAPI 6

Same name and namespace in other branches

1. 5 imagefilter.inc \_imageapi_gd_pixel_grayscale()

1 string reference to '_imageapi_gd_pixel_grayscale'

imagefilter in ./imagefilter.inc

File

./imagefilter.inc, line 60

Code

function _imageapi_gd_pixel_grayscale(&$r, &$g, &$b, &$a) {
  $r = round($r * 0.299 + $g * 0.587 + $b * 0.114);
  $g = $r;
  $b = $r;
}