PHP GD image negative Color
This example shows how to set the negative color of an image in php gd.
This example shows how to set the negative color of an image in php gd.<?php
function negate($image)
{
if(function_exists('imagefilter'))
{
return imagefilter($image, IMG_FILTER_NEGATE);
}
for($x = 0; $x < imagesx($image); ++$x)
{
for($y = 0; $y < imagesy($image); ++$y)
{
$index = imagecolorat($image, $x, $y);
$rgb = imagecolorsforindex($index);
$color = imagecolorallocate($image, 255 - $rgb['red'], 255 - $rgb['green'], 255 - $rgb['blue']);
imagesetpixel($im, $x, $y, $color);
}
}
return(true);
}
$image = imagecreatefromjpeg('image1.jpg');
if($image && negate($image))
{
echo 'Image successfully converted to negative colors.';
imagejpeg($image, 'image1.jpg', 100);
imagedestroy($image);
}
else
{
echo 'Negative color conversion failed.';
}
?>
After running the program you will get the following output
