The imagecolorclosest() function gets the index of the closest color to the specified color.
Syntax
imagecolorallocatealpha (img, red, green, blue)
Parameters
img: Image resource created with imagecreatetruecolor().
red: Red color component
green: Green color component
blue: Blue color component
Return
The imagecolorclosest() function returns the index of the closest color, in the palette of the image.
Example
The following is an example:
<?php
$img = imagecreatefrompng('https://www.tutorialspoint.com/assets/videos/courses/19/images/course_19_image.png');
imagetruecolortopalette($img, false, 255);
$val = imagecolorclosest($img, 20, 90, 140);
$val = imagecolorsforindex($img, $val);
$val = "({$val['red']}, {$val['green']}, {$val['blue']})";
echo "Closest = " . $val;
imagedestroy($img);
?>Output
The following is the output:
Closest = (44, 118, 140)
Example
Let us see another example wherein we have different image and color components:
<?php
$img = imagecreatefrompng('https://www.tutorialspoint.com/images/Swift.png');
imagetruecolortopalette($img, false, 255);
$val = imagecolorclosest($img, 10, 130, 80);
$val = imagecolorsforindex($img, $val);
$val = "({$val['red']}, {$val['green']}, {$val['blue']})";
echo "Closest = " . $val;
imagedestroy($img);
?>Output
The following is the output:
Closest = (228, 74, 76)