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Get the index of the color of a pixel


imagecolorat

(PHP 4, PHP 5)

imagecoloratGet 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");
$rgb imagecolorat($im1015);
$r = ($rgb >> 16) & 0xFF;
$g = ($rgb >> 8) & 0xFF;
$b $rgb 0xFF;

var_dump($r$g$b);
?>

The above example will output something similar to:

 int(119) int(123) int(180) 

Example #2 Human-readable RGB values using imagecolorsforindex()

<?php
$im 
imagecreatefrompng("php.png");
$rgb imagecolorat($im1015);

$colors imagecolorsforindex($im$rgb);

var_dump($colors);
?>

The above example will output something similar to:

 array(4) { ["red"]=> int(119) ["green"]=> int(123) ["blue"]=> int(180) ["alpha"]=> int(127) } 

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