(PHP 4, PHP 5, PHP 7)
imagecolorset — Set the color for the specified palette index
$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.
imageAn image resource, returned by one of the image creation functions, such as imagecreatetruecolor().
indexAn index in the palette.
redValue of red component.
greenValue of green component.
blueValue of blue component.
alphaValue of alpha component.
No value is returned.
| Version | Description |
|---|---|
| 5.4.0 |
The alpha parameter was added.
|
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);
?>