imagecolorsforindex

(PHP 4, PHP 5, PHP 7)

Get the colors for an index

array imagecolorsforindex ( resource $image, int $index )

Gets the color for a specified index.

Parameters:

image

An image resource, returned by one of the image creation functions, such as imagecreatetruecolor().

index

The color index.

Returns:

Returns an associative array with red, green, blue and alpha keys that contain the appropriate values for the specified color index.

Examples:

imagecolorsforindex() example

<?php
 
// open an image
$im = imagecreatefrompng('nexen.png');
 
// get a color
$start_x = 40;
$start_y = 50;
$color_index = imagecolorat($im, $start_x, $start_y);
 
// make it human readable
$color_tran = imagecolorsforindex($im, $color_index);
 
// what is it ?
print_r($color_tran);
 
?>

The above example will output something similar to:

Array
(
   [red] => 226
   [green] => 222
   [blue] => 252
   [alpha] => 0
)