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().
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