(PHP 4 >= 4.3.2, PHP 5, PHP 7)
imageistruecolor — ���ͼ���Ƿ�Ϊ���ɫͼ��
$image
) : bool
imageistruecolor() ���
image ͼ���Ƿ�Ϊ���ɫͼ��
��� image �����ɫͼ�� TRUE������ FALSE��
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($im));
imagecopy($tc, $im, 0, 0, 0, 0, imagesx($im), imagesy($im));
imagedestroy($im);
$im = $tc;
$tc = NULL;
}
// Continue working with image instance
?>
Note: �˺�����Ҫ GD 2.0.1 ����߰汾(�Ƽ� 2.0.28 �����߰汾)��