function 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);
?>

imagecolorset

Description

Parameters

Return Values

Changelog

Examples

See Also