(PHP 4, PHP 5)
imagecolorstotal — Find out the number of colors in an image's palette
Returns the number of colors in an image palette.
An image resource, returned by one of the image creation functions, such as imagecreatefromgif().
Returns the number of colors in the specified image's palette or 0 for truecolor images.
Пример #1 Getting total number of colors in an image using imagecolorstotal()
<?php
// Create image instance
$im = imagecreatefromgif('php.gif');
echo 'Total colors in image: ' . imagecolorstotal($im);
// Free image
imagedestroy($im);
?>
Результатом выполнения данного примера будет что-то подобное:
Total colors in image: 128