imagecolorresolvealpha
(PHP 4 >= 4.0.6, PHP 5, PHP 7)
imagecolorresolvealpha — Get the index of the specified color + alpha or its closest possible alternative
Description
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.
Parameters
`image` An image resource, returned by one of the image creation functions, such as imagecreatetruecolor().
red
Value of red component.
green
Value of green component.
blue
Value of blue component.
alpha
A value between 0 and 127. 0 indicates completely opaque while 127 indicates completely transparent.
The colors parameters are integers between 0 and 255 or hexadecimals between 0x00 and 0xFF.
Return Values
Returns a color index.
Examples
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);
?>The above example will output something similar to:
Array
(
[0] => 89
[1] => 85
)See Also
- imagecolorclosestalpha() - Get the index of the closest color to the specified color + alpha
← imagecolorresolve
imagecolorset →
© 1997–2017 The PHP Documentation GroupLicensed under the Creative Commons Attribution License v3.0 or later.
本文档系腾讯云开发者社区成员共同维护，如有问题请联系 cloudcommunity@tencent.com
