update : 2015.11.03
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Find out the number of colors in an image's palette

imagecolorstotal

(PHP 4, PHP 5, PHP 7)

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

설명

int imagecolorstotal ( resource $image )

Returns the number of colors in an image palette.

인수

image

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

반환값

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

예제

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);
?>

위 예제의 출력 예시:

Total colors in image: 128

참고