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HOME > PHP Manual > imagecolorallocate - Allocate a color for an image

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PHP Manual

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);

?>

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