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    <p><strong>Introduction</strong></p> <p>I think you should get Imagemagick installed because what you want is a simple <code>vignette</code> effect, You can easily so that with <a href="http://php.net/manual/en/book.imagick.php" rel="noreferrer">ImageMagic</a> (<code>convert input.jpg -background black -vignette 70x80 output.png</code>) without having to loop every pixel which can be very slow when dealing with large images </p> <p><strong>Original Image</strong></p> <pre><code>$file = __DIR__ . "/golf.jpg"; </code></pre> <p><img src="https://i.stack.imgur.com/i04gl.jpg" alt="enter image description here"></p> <p><strong>Effect 1</strong></p> <pre><code>$image = new imagick($file); $image-&gt;vignetteImage(20, 20, 40, - 20); header("Content-Type: image/png"); echo $image; </code></pre> <p><img src="https://i.stack.imgur.com/dn0iR.jpg" alt="enter image description here"></p> <p><strong>Effect 2</strong></p> <pre><code>$image = new imagick($file); $image-&gt;vignetteImage(100, 100, 200, 200); header("Content-Type: image/png"); echo $image; </code></pre> <p><img src="https://i.stack.imgur.com/3Orcb.jpg" alt="enter image description here"></p> <p><strong>vignette with GD</strong></p> <p>Well if you are forced to use GB ... Use can use this <a href="http://www.php.net/manual/en/function.imagefilter.php#109809" rel="noreferrer">cool vignette script</a> </p> <pre><code>function vignette($im) { $width = imagesx($im); $height = imagesy($im); $effect = function ($x, $y, &amp;$rgb) use($width, $height) { $sharp = 0.4; // 0 - 10 small is sharpnes, $level = 0.7; // 0 - 1 small is brighter $l = sin(M_PI / $width * $x) * sin(M_PI / $height * $y); $l = pow($l, $sharp); $l = 1 - $level * (1 - $l); $rgb['red'] *= $l; $rgb['green'] *= $l; $rgb['blue'] *= $l; }; for($x = 0; $x &lt; imagesx($im); ++ $x) { for($y = 0; $y &lt; imagesy($im); ++ $y) { $index = imagecolorat($im, $x, $y); $rgb = imagecolorsforindex($im, $index); $effect($x, $y, $rgb); $color = imagecolorallocate($im, $rgb['red'], $rgb['green'], $rgb['blue']); imagesetpixel($im, $x, $y, $color); } } return (true); } </code></pre> <p><strong>Faster GD vignette approach</strong></p> <p>A better approached used in <a href="https://github.com/marchibbins/GD-Filter-testing" rel="noreferrer">GD Filter testing</a> would be ... to create a mask and over lay</p> <pre><code> $overlay = 'vignette_white.png'; $png = imagecreatefrompng($overlay); imagecopyresampled($filter, $png, 0, 0, 0, 0, $width, $height, $width, $height); </code></pre> <ul> <li><a href="https://github.com/marchibbins/GD-Filter-testing/blob/master/process.php" rel="noreferrer">Full Code</a> </li> <li><a href="http://marchibbins.com/dev/gd/" rel="noreferrer">Cool Demos Of the filter combination</a></li> </ul> <p>The only disadvantage is that The image must be the same size with the mask for the effect to look cool</p> <p><strong>Conclusion</strong> </p> <p>If this is what you mean by <code>radial transparent gradient</code> then i advice you to get <code>ImageMagic</code> if not at least the lady the picture is cute.</p>
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    1. POHow can I have a nice radial transparent gradient applied to an image with PHP?
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    1. COhaha true and thanks for the reply but the image gradient is fading out to white not transparent. Is it simply not possible? If you'll notice the marginal image in the post can fade out to any background.
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    2. COYou can easily change the background in the GB version .... Can you use Imagemagic ?
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