Get the index of the closest color to the specified color in PHP
Description
The following code shows how to get the index of the closest color to the specified color.
Example
<?php/*from ww w.j av a2 s .com*/
// Start with an image and convert it to a palette-based image
$im = imagecreatefrompng('./test.png');
imagetruecolortopalette($im, false, 255);
// Search colors (RGB)
$colors = array(
array(254, 145, 154),
array(153, 145, 188),
array(153, 90, 145),
array(255, 137, 92)
);
// Loop through each search and find the closest color in the palette.
// Return the search number, the search RGB and the converted RGB match
foreach($colors as $id => $rgb)
{
$result = imagecolorclosest($im, $rgb[0], $rgb[1], $rgb[2]);
$result = imagecolorsforindex($im, $result);
$result = "({$result['red']}, {$result['green']}, {$result['blue']})";
echo "#$id: Search ($rgb[0], $rgb[1], $rgb[2]); Closest match: $result.\n";
}
imagedestroy($im);
?>
The code above generates the following result.