imagecolorresolvealpha
(PHP 4 >= 4.0.6, PHP 5)
imagecolorresolvealpha — Get the index of the specified color + alpha or its closest possible alternative
Description
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.
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
)
Notes
Note: This function requires GD 2.0.1 or later (2.0.28 or later is recommended).
See Also
- imagecolorclosestalpha() - Get the index of the closest color to the specified color + alpha