imagecolorresolvealpha
(PHP 4 >= 4.0.6, PHP 5, PHP 7, PHP 8)
imagecolorresolvealpha — 取得指定颜色 + alpha 的索引值或有可能得到的最接近的替代值
说明
imagecolorresolvealpha(
resource
int
int
int
int
): int
resource
$image
,int
$red
,int
$green
,int
$blue
,int
$alpha
): int
本函数可以保证对所请求的颜色返回一个颜色索引,要么是确切值要么是所能得到最接近的替代值。
参数
-
image
-
由图象创建函数(例如imagecreatetruecolor())返回的 GdImage 对象。
-
red
-
红色成分的值。
-
green
-
绿色成分的值。
-
blue
-
蓝色成分的值。
-
alpha
-
A value between
0
and127
.0
indicates completely opaque while127
indicates completely transparent.
返回值
Returns a color index.
范例
示例 #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);
?>
以上例程的输出类似于:
Array ( [0] => 89 [1] => 85 )
注释

User Contributed Notes
There are no user contributed notes for this page.
备份地址:http://www.lvesu.com/blog/php/function.imagecolorresolvealpha.php