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(PHP 3, PHP 4, PHP 5)

imagecolorallocate -- Allocate a color for an image


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.

Poznámka: The first call to imagecolorallocate() fills the background color in palette-based images - images created using imagecreate().

Seznam parametrů


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.

Návratové hodnoty

A color identifier or FALSE if the allocation failed.

ChangeLog (záznam změn)

Prior to 5.1.3 Returns -1 if the allocation failed.


Příklad 1. imagecolorallocate() example


= 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);