   #PHP Manual Image functions imagecolorallocatealpha imagecolorclosest

   PHP Manual
   Prev  Next
   ______________________________________________________________________

                                 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().
   ______________________________________________________________________

   Prev                    Home              Next
   imagecolorallocatealpha  Up  imagecolorclosest
