imagecolorexactalpha
(PHP 4 >= 4.0.6, PHP 5, PHP 7, PHP 8)
imagecolorexactalpha — Get the index of the specified color + alpha
Description
Returns the index of the specified color+alpha in the palette of the image.
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 the index of the specified color+alpha in the palette of the image, or -1 if the color does not exist in the image's palette.
Changelog
| Version | Description |
|---|---|
| 8.0.0 |
image expects a GdImage
instance now; previously, a resource was expected.
|
Examples
Example #1 Get colors from the GD logo
<?php
// Setup an image
$im = imagecreatefrompng('./gdlogo.png');
$colors = Array();
$colors[] = imagecolorexactalpha($im, 255, 0, 0, 0);
$colors[] = imagecolorexactalpha($im, 0, 0, 0, 127);
$colors[] = imagecolorexactalpha($im, 255, 255, 255, 55);
$colors[] = imagecolorexactalpha($im, 100, 255, 52, 20);
print_r($colors);
// Free from memory
imagedestroy($im);
?>
The above example will output something similar to:
Array
(
[0] => 16711680
[1] => 2130706432
[2] => 939524095
[3] => 342163252
)
See Also
- imagecolorclosestalpha() - Get the index of the closest color to the specified color + alpha
Here you can write a comment
There are no comments available yet.
