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imagecolorclosestalpha() function in PHP
The imagecolorclosestalpha() function gets the index of closet color with alpha value.
Syntax
imagecolorclosestalpha ( img, red, green, blue, alpha )
Parameters
img: Image resource created with imagecreatetruecolor().
red: Red color component
green: Green color component
blue: Blue color component
alpha: The transparency of image, with 0 indicating completely opaque, whereas 127 indicating completely transparent.
Return
The imagecolorclosestalpha() function returns the index of the closest color in the palette.
Example
The following is an example:
<?php
$img = imagecreatefrompng('http://www.tutorialspoint.com/images/tp-logo-diamond.png');
imagetruecolortopalette($img, false, 255);
$match = imagecolorclosestalpha($img, 180, 100, 150, 110);
$match = imagecolorsforindex($img, $match);
$match = "({$match['red']}, {$match['green']},
{$match['blue']}, {$match['alpha']})";
echo $match;
imagedestroy($img);
?>Output
The following is the output:
(140, 130, 140, 0)
Updated on: 31-Dec-2019
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