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PO
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16525497
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2013-05-13T15:15:39.210
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2013-06-01T21:03:46.163
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2013-06-01T21:03:46.163
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text
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<p>Thanks to the function linked by @Baba I was able to alter the script to allow for semi transparent vignette effect. </p> <pre><code><?php class PhotoEffect { private $_photoLocation; private $_width; private $_height; private $_type; private $_originalImage; private $_afterImage; /** * Load image URL in constructor */ final public function __construct($photoLocation) { $this->_photoLocation = $photoLocation; if (!$size = @getimagesize($this->_photoLocation)){ throw new Exception('Image cannot be handled'); } $this->_width = $size[0]; $this->_height = $size[1]; $this->_type = $size[2]; switch ( $this->_type ) { case IMAGETYPE_GIF: $this->_originalImage = imagecreatefromgif($this->_photoLocation); break; case IMAGETYPE_JPEG: $this->_originalImage = imagecreatefromjpeg($this->_photoLocation); break; case IMAGETYPE_PNG: $this->_originalImage = imagecreatefrompng($this->_photoLocation); break; default: throw new Exception('Unknown image type'); } } /** * Destroy created images */ final private function __destruct() { if (!empty($this->_originalImage)) { imagedestroy($this->_originalImage); } if (!empty($this->_afterImage)) { imagedestroy($this->_afterImage); } } /** * Apply vignette effect */ final public function Vignette($sharp=0.4, $level=1, $alpha=1) { if (empty($this->_originalImage)) { throw new Exception('No image'); } if (!is_numeric($sharp) || !($sharp>=0 && $sharp<=10)) { throw new Exception('sharp must be between 0 and 10'); } if (!is_numeric($level) || !($level>=0 && $level<=1)) { throw new Exception('level must be between 0 and 10'); } if (!is_numeric($alpha) || !($alpha>=0 && $alpha<=10)) { throw new Exception('alpha must be between 0 and 1'); } $this->_afterImage = imagecreatetruecolor($this->_width, $this->_height); imagesavealpha($this->_afterImage, true); $trans_colour = imagecolorallocatealpha($this->_afterImage, 0, 0, 0, 127); imagefill($this->_afterImage, 0, 0, $trans_colour); for($x = 0; $x < $this->_width; ++$x){ for($y = 0; $y < $this->_height; ++$y){ $index = imagecolorat($this->_originalImage, $x, $y); $rgb = imagecolorsforindex($this->_originalImage, $index); $l = sin(M_PI / $this->_width * $x) * sin(M_PI / $this->_height * $y); $l = pow($l, $sharp); $l = 1 - $level * (1 - $l); $rgb['red'] *= $l; $rgb['green'] *= $l; $rgb['blue'] *= $l; $rgb['alpha'] = 127 - (127 * ($l*$alpha)); $color = imagecolorallocatealpha($this->_afterImage, $rgb['red'], $rgb['green'], $rgb['blue'], $rgb['alpha']); imagesetpixel($this->_afterImage, $x, $y, $color); } } } /** * Ouput PNG with correct header */ final public function OutputPng() { if (empty($this->_afterImage)) { if (empty($this->_originalImage)) { throw new Exception('No image'); } $this->_afterImage = $this->_originalImage; } header('Content-type: image/png'); imagepng($this->_afterImage); } /** * Save PNG */ final public function SavePng($filename) { if (empty($filename)) { throw new Exception('Filename is required'); } if (empty($this->_afterImage)) { if (empty($this->_originalImage)) { throw new Exception('No image'); } $this->_afterImage = $this->_originalImage; } imagepng($this->_afterImage, $filename); } } /** * How to use */ $effect = new PhotoEffect('test.jpg'); $effect->Vignette(); $effect->OutputPng(); ?> </code></pre> <p><a href="http://phpfiddle.org/main/code/4pi-kcw" rel="nofollow">Working phpfiddle</a> with the only image I could find on their server, so not that big.</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. USHugo Delsing
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1. POHow can I have a nice radial transparent gradient applied to an image with PHP?
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