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(PHP 3, 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:

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;
?>

Related Function(s)

imagecolorset()

imagecolorsforindex()