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imagecolorset

PHP function Edit on GitHub ✎

(PHP 4, PHP 5, PHP 7, PHP 8)

Set the color for the specified palette index

Description

imagecolorset(GdImage $image, int $color, int $red, int $green, int $blue, int $alpha = 0): false|null

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

color: An index in the palette.
red: Red
green: Green
blue: Blue
alpha: Value of alpha component.

Return Values

The function returns null on success, Falseforfailure.

Changelog

Version	Description

Examples

imagecolorset() example

php

<?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 background to be blue
imagecolorset($im, $bg, 0, 0, 255);

// Output the image to the browser
header('Content-Type: image/png');

imagepng($im);
?>