imageistruecolor
(PHP 4 >= 4.3.2, PHP 5)
imageistruecolor — Finds whether an image is a truecolor image
說明
bool imageistruecolor
( resource
$image
)
imageistruecolor() finds whether the image
image is a truecolor image.
回傳值
Returns TRUE if the image is truecolor, FALSE
otherwise.
範例
Example #1 Simple detection of true color image instances using imageistruecolor()
<?php
// $im is an image instance
// Check if image is a true color image or not
if(!imageistruecolor($im))
{
// Create a new true color image instance
$tc = imagecreatetruecolor(imagesx($im), imagesy($im));
// Copy over the pixels
imagecopy($tc, $im, 0, 0, 0, 0, imagesx($im), imagesy($im));
imagedestroy($im);
$im = $tc;
$tc = NULL;
// OR use imagepalettetotruecolor()
}
// Continue working with image instance
?>
註釋
Note: 本函式需要 GD 2.0.1 或更高版本（推薦 2.0.28 及更高版本）。
參見
- imagecreatetruecolor() - Create a new true color image
- imagepalettetotruecolor() - Converts a palette based image to true color
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