imagecolorstotal
(PHP 4, PHP 5)
imagecolorstotal — Find out the number of colors in an image's palette
說明
int imagecolorstotal
( resource
$image
)Returns the number of colors in an image palette.
參數
-
image -
An image resource, returned by one of the image creation functions, such as imagecreatefromgif().
回傳值
Returns the number of colors in the specified image's palette or 0 for truecolor images.
範例
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);
?>
上例的輸出類似於：
Total colors in image: 128
參見
- 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
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