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imagecolorallocate

PHP function Edit on GitHub ✎

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

Allocate a color for an image

Description

imagecolorallocate(GdImage $image, int $red, int $green, int $blue): int|false

Returns a color identifier representing the color composed of the given RGB components.

imagecolorallocate() must be called to create each color that is to be used in the image represented by image.

Note

The first call to imagecolorallocate() fills the background color in palette-based images - images created using imagecreate().

Parameters

red: Red
green: Green
blue: Blue

These parameters are integers between 0 and 255 or hexadecimals between 0x00 and 0xFF.

Return Values

A color identifier or false if the allocation failed.

Falseproblem

Changelog

Version	Description

Examples

imagecolorallocate() example

php

<?php

$im = imagecreate(100, 100);

// sets background to red
$background = imagecolorallocate($im, 255, 0, 0);

// sets some colors
$white = imagecolorallocate($im, 255, 255, 255);
$black = imagecolorallocate($im, 0, 0, 0);

// hexadecimal way
$white = imagecolorallocate($im, 0xFF, 0xFF, 0xFF);
$black = imagecolorallocate($im, 0x00, 0x00, 0x00);

?>