imagecolorresolvealpha
(PHP 4 >= 4.0.6, PHP 5)
imagecolorresolvealpha — Get the index of the specified color + alpha or its closest possible alternative
說明
int imagecolorresolvealpha
( resource
$image
, int $red
, int $green
, int $blue
, int $alpha
)This function is guaranteed to return a color index for a requested color, either the exact color or the closest possible alternative.
參數
-
image -
由影像建立函式(例如imagecreatetruecolor())回傳的影像資源。
-
red -
紅色成分的值。
-
green -
綠色成分的值。
-
blue -
藍色成分的值。
-
alpha -
A value between 0 and 127. 0 indicates completely opaque while 127 indicates completely transparent.
回傳值
Returns a color index.
範例
Example #1 Using imagecoloresolvealpha() to get colors from an image
<?php
// Load an image
$im = imagecreatefromgif('phplogo.gif');
// Get closest colors from the image
$colors = array();
$colors[] = imagecolorresolvealpha($im, 255, 255, 255, 0);
$colors[] = imagecolorresolvealpha($im, 0, 0, 200, 127);
// Output
print_r($colors);
imagedestroy($im);
?>
上例的輸出類似於：
Array
(
[0] => 89
[1] => 85
)
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）。
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