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Website Programming in PHP / MYSQL
imagecolorallocate
(PHP 4, PHP 5)
imagecolorallocate — Allocate a color for an image
Description
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
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);
?>
