imagecolorallocate

(PHP 4, PHP 5)

imagecolorallocate — Allocate a color for an image

Description

int imagecolorallocate ( resource $image , int $red , int $green , int $blue )

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

image

An image resource, returned by one of the image creation functions, such as imagecreatetruecolor().

red

Value of red component.

green

Value of green component.

blue

Value of blue component.

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.

Changelog

Version	Description
Prior to 5.1.3	Returns -1 if the allocation failed.

Examples

Example #1 imagecolorallocate() example

<?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);

?>

See Also

• imagecolorallocatealpha() - Allocate a color for an image
• imagecolordeallocate() - De-allocate a color for an image