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array imagecolorsforindex ( resource $image , int $index )

<?php

// Open an image
$im = imagecreatefrompng('tutorialpro-logo.png');

// Get the color of a point
$start_x = 40;
$start_y = 20;
$color_index = imagecolorat($im, $start_x, $start_y);

// Make it readable
$color_tran = imagecolorsforindex($im, $color_index);

// Display the color values
print_r($color_tran);

?>

Array
(
    [red] => 195
    [green] => 223
    [blue] => 165
    [alpha] => 64
)