imagecolorset
(PHP 4, PHP 5)
imagecolorset — Set the color for the specified palette index
Description
void imagecolorset
( resource $image
, int $index
, int $red
, int $green
, int $blue
[, int $alpha = 0
] )
This sets the specified index in the palette to the specified color. This is useful for creating flood-fill-like effects in palleted images without the overhead of performing the actual flood-fill.
Parameters
- image
-
An image resource, returned by one of the image creation functions, such as imagecreatetruecolor().
- index
-
An index in the palette.
- red
-
Value of red component.
- green
-
Value of green component.
- blue
-
Value of blue component.
- alpha
-
Value of alpha component.
Return Values
No value is returned.
Changelog
| Version | Description |
|---|---|
| 5.4.0 | The alpha parameter was added. |
Examples
Example #1 imagecolorset() example
<?php
// Create a 300x100 image
$im = imagecreate(300, 100);
// Set the background to be red
imagecolorallocate($im, 255, 0, 0);
// Get the color index for the background
$bg = imagecolorat($im, 0, 0);
// Set the backgrund to be blue
imagecolorset($im, $bg, 0, 0, 255);
// Output the image to the browser
header('Content-Type: image/png');
imagepng($im);
imagedestroy($im);
?>