C'est la même fonction, mais en mettant imagecolorstotal
hors de la boucle, on évite de le recalculer a chaque fois
(comme le nombre de couleurs de l'image n'est pas censé
changé, il vaut mieux ne faire le test qu'une fois).
<?php
function imagetograyscale($im)
{
if (imageistruecolor($im)) {
imagetruecolortopalette($im, false, 256);
}
$total = imagecolorstotal($im);
for ($c = 0; $c < $total; $c++) {
$col = imagecolorsforindex($im, $c);
$gray = round(0.299 * $col['red'] + 0.587 *
$col['green'] + 0.114 * $col['blue']);
imagecolorset($im, $c, $gray, $gray, $gray);
}
}
?>
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