imagecolorstotal

(PHP 4, PHP 5, PHP 7)

Find out the number of colors in an image's palette

int imagecolorstotal ( resource $image )

Returns the number of colors in an image palette.

Parameters:

image

An image resource, returned by one of the image creation functions, such as imagecreatefromgif().

Returns:

Returns the number of colors in the specified image's palette or 0 for truecolor images.

Examples:

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);
?>

The above example will output something similar to:

Total colors in image: 128