Developer Forums | About Us | Site Map
Search  
HOME > PHPMANUAL


Sponsors





Web Host
site hosted by netplex
Partners

Online Manuals

imagecolorat

(PHP 3, PHP 4 )

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:

Example 1. Access distinct RGB values

<?php
$im = ImageCreateFromPng("rockym.png");
$rgb = ImageColorAt($im, 100, 100);
$r = ($rgb >> 16) & 0xFF;
$g = ($rgb >> 8) & 0xFF;
$b = $rgb & 0xFF;
 ?>

See also imagecolorset() and imagecolorsforindex().

Copyright 2004-2024 GrindingGears.com. All rights reserved. Site hosted by NETPLEX