Image
PHP Manual

imagecolorat

(PHP 4, PHP 5)

imagecolorat — Get the index of the color of a pixel

Description

int imagecolorat ( resource $image , int $x , int $y )

Returns the index of the color of the pixel at the specified location in the image specified by image .

If PHP is compiled against GD library 2.0 or higher and the image is a truecolor image, this function returns the RGB value of that pixel as integer. Use bitshifting and masking to access the distinct red, green and blue component values:

Parameters

image

An image resource, returned by one of the image creation functions, such as imagecreatetruecolor().

x

x-coordinate of the point

y

y-coordinate of the point

Return Values

Returns the index of the color.

Examples

Example#1 Access distinct RGB values

<?php
$im 
imagecreatefrompng("php.png");
$rgb imagecolorat($im1015);
$r = ($rgb >> 16) & 0xFF;
$g = ($rgb >> 8) & 0xFF;
$b $rgb 0xFF;
?>

The above example will output something similar to:

int(119) int(123) int(180)

See Also


Image
PHP Manual