(PHP 4, PHP 5)
imagecolorallocate — Allocate a color for an image
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().
An image resource, returned by one of the image creation functions, such as imagecreatetruecolor().
Value of red component.
Value of green component.
Value of blue component.
These parameters are integers between 0 and 255 or hexadecimals between 0x00 and 0xFF.
A color identifier or FALSE if the allocation failed.
| Version | Description |
|---|---|
| Prior to 5.1.3 | Returns -1 if the allocation failed. |
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);
?>