(PHP 4 >= 4.0.6, PHP 5, PHP 7)
imagecolorexactalpha — ȡ��ָ������ɫ�����ȵ�����ֵ
$image
, int $red
, int $green
, int $blue
, int $alpha
) : int����ͼ���ɫ����ָ����ɫ�����ȵ�����ֵ��
image
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red
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green
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blue
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alpha
A value between 0 and 127. 0 indicates completely opaque while 127 indicates completely transparent.
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Example #1 Get colors from the GD logo
<?php
// Setup an image
$im = imagecreatefrompng('./gdlogo.png');
$colors = Array();
$colors[] = imagecolorexactalpha($im, 255, 0, 0, 0);
$colors[] = imagecolorexactalpha($im, 0, 0, 0, 127);
$colors[] = imagecolorexactalpha($im, 255, 255, 255, 55);
$colors[] = imagecolorexactalpha($im, 100, 255, 52, 20);
print_r($colors);
// Free from memory
imagedestroy($im);
?>
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Array ( [0] => 16711680 [1] => 2130706432 [2] => 939524095 [3] => 342163252 )
Note: �˺�����Ҫ GD 2.0.1 ����߰汾(�Ƽ� 2.0.28 �����߰汾)��