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

imagecolorsforindex

imagecolortransparent

GD and Image Functions

imagecolorstotal

(PHP 4, PHP 5)

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

Description

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().

Return Values

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

Examples

Example #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);
?>

The above example will output something similar to:

 Total colors in image: 128

See Also

imagecolorat() - Get the index of the color of a pixel
imagecolorsforindex() - Get the colors for an index
imageistruecolor() - Finds whether an image is a truecolor image

imagecolorsforindex

imagecolortransparent

GD and Image Functions