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Website Programming in PHP / MYSQL
imagecolorat
(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:
Parameters
- image
-
An image resource, returned by one of the image creation functions, such as imagecreatetruecolor().
- x
-
x-coordinate of the point
- y
-
y-coordinate of the point
Return Values
Returns the index of the color.
Examples
Example #1 Access distinct RGB values
<?php
$im = imagecreatefrompng("php.png");
$rgb = imagecolorat($im, 10, 15);
$r = ($rgb >> 16) & 0xFF;
$g = ($rgb >> 8) & 0xFF;
$b = $rgb & 0xFF;
?>
The above example will output something similar to:
int(119) int(123) int(180)
