imagecolorresolvealpha
(PHP 4 >= 4.0.6, PHP 5, PHP 7, PHP 8)
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 -
A GdImage object, 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
0and127.0indicates completely opaque while127indicates completely transparent.
Return Values
Returns a color index.
Changelog
| Version | Description |
|---|---|
| 8.0.0 |
image expects a GdImage
instance now; previously, a resource was expected.
|
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
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