imagecolorallocate
(PHP 4, PHP 5)
imagecolorallocate — Allocate a color for an image
Description
$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.
Return Values
A color identifier or FALSE if the allocation failed.
This function may
return Boolean FALSE, but may also return a non-Boolean value which
evaluates to FALSE. Please read the section on Booleans for more
information. Use the ===
operator for testing the return value of this
function.
Changelog
| Version | Description |
|---|---|
| 5.1.3 |
Returns FALSE if the allocation failed. Previously
-1 was returned.
|
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
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