PHP imagecolorat - get the color value of a pixel index
imagecolorat - get the color index value of a pixel.
grammar
int imagecolorat ( resource $image , int $x , int $y )
Returns the image specified by the drawing color of the pixel location specified index.
If PHP is compiled with the GD library 2.0 or later and the image is a true color image, this function returns an integer RGB values of that point. By displacing the mask to get the value of the red, green, and blue components of each.
Examples
To obtain the respective RGB values.
<?php
$im = ImageCreateFromPng("w3big-logo.png");
$rgb = ImageColorAt($im, 100, 25);
$r = ($rgb >> 16) & 0xFF;
$g = ($rgb >> 8) & 0xFF;
$b = $rgb & 0xFF;
?>
related articles
- imagecolorset () to set the color palette index specified.
- imagecolorsforindex () to obtain an index color.