imagecolorexactalpha
imagecolorexactalpha
(PHP 4 >= 4.0.6, PHP 5, PHP 7)
imagecolorexactalpha — Get the index of the specified color + alpha
Description
int imagecolorexactalpha ( resource $image , int $red , int $green , int $blue , int $alpha )
Returns the index of the specified color+alpha in the palette of the image.
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 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.
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
← imagecolorexact
imagecolormatch →
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Licensed under the Creative Commons Attribution License v3.0 or later.
https://secure.php.net/manual/en/function.imagecolorexactalpha.php
