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<?php |
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/** |
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##DOC-SIGNATURE## |
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This file is part of WideImage. |
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WideImage is free software; you can redistribute it and/or modify |
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it under the terms of the GNU Lesser General Public License as published by |
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the Free Software Foundation; either version 2.1 of the License, or |
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(at your option) any later version. |
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WideImage is distributed in the hope that it will be useful, |
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but WITHOUT ANY WARRANTY; without even the implied warranty of |
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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GNU Lesser General Public License for more details. |
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You should have received a copy of the GNU Lesser General Public License |
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along with WideImage; if not, write to the Free Software |
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
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* @package Internal/Operations |
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**/ |
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namespace WideImage\Operation; |
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/** |
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* Unsharp filter |
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* |
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* This filter was taken from http://vikjavev.no/computing/ump.php, |
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* the original author Torstein Hønsi. Adapted to fit better within |
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* the Wideimage package. |
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* |
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* @package Internal/Operations |
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*/ |
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class Unsharp |
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{ |
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/** |
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* Returns sharpened image |
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* |
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* @param \WideImage\Image $image |
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* @param float $amount |
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* @param int $radius |
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* @param float $threshold |
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* @return \WideImage\Image |
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*/ |
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public function execute($image, $amount, $radius, $threshold) |
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{ |
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// Attempt to calibrate the parameters to Photoshop: |
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if ($amount > 500) { |
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$amount = 500; |
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} |
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$amount = $amount * 0.016; |
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if ($radius > 50) { |
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$radius = 50; |
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} |
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$radius = $radius * 2; |
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if ($threshold > 255) { |
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$threshold = 255; |
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} |
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$radius = abs(round($radius)); // Only integers make sense. |
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if ($radius == 0) { |
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return $image; |
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} |
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// Gaussian blur matrix |
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$matrix = array( |
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array(1, 2, 1), |
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array(2, 4, 2), |
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array(1, 2, 1) |
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); |
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$blurred = $image->applyConvolution($matrix, 16, 0); |
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if ($threshold > 0) { |
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// Calculate the difference between the blurred pixels and the original |
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// and set the pixels |
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for ($x = 0; $x < $image->getWidth(); $x++) { |
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for ($y = 0; $y < $image->getHeight(); $y++) { |
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$rgbOrig = $image->getRGBAt($x, $y); |
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$rOrig = $rgbOrig["red"]; |
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$gOrig = $rgbOrig["green"]; |
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$bOrig = $rgbOrig["blue"]; |
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$rgbBlur = $blurred->getRGBAt($x, $y); |
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$rBlur = $rgbBlur["red"]; |
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$gBlur = $rgbBlur["green"]; |
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$bBlur = $rgbBlur["blue"]; |
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// When the masked pixels differ less from the original |
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// than the threshold specifies, they are set to their original value. |
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$rNew = (abs($rOrig - $rBlur) >= $threshold) |
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? max(0, min(255, ($amount * ($rOrig - $rBlur)) + $rOrig)) |
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: $rOrig; |
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$gNew = (abs($gOrig - $gBlur) >= $threshold) |
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? max(0, min(255, ($amount * ($gOrig - $gBlur)) + $gOrig)) |
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: $gOrig; |
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$bNew = (abs($bOrig - $bBlur) >= $threshold) |
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? max(0, min(255, ($amount * ($bOrig - $bBlur)) + $bOrig)) |
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: $bOrig; |
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$rgbNew = array("red" => $rNew, "green" => $gNew, "blue" => $bNew, "alpha" => 0); |
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if (($rOrig != $rNew) || ($gOrig != $gNew) || ($bOrig != $bNew)) { |
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$image->setRGBAt($x, $y, $rgbNew); |
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} |
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} |
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} |
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} else { |
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$w = $image->getWidth(); |
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$h = $image->getHeight(); |
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for ($x = 0; $x < $w; $x++) { |
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for ($y = 0; $y < $h; $y++) { |
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$rgbOrig = $image->getRGBAt($x, $y); |
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$rOrig = $rgbOrig["red"]; |
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$gOrig = $rgbOrig["green"]; |
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$bOrig = $rgbOrig["blue"]; |
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$rgbBlur = $blurred->getRGBAt($x, $y); |
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$rBlur = $rgbBlur["red"]; |
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$gBlur = $rgbBlur["green"]; |
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$bBlur = $rgbBlur["blue"]; |
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$rNew = static::bit(($amount * ($rOrig - $rBlur)) + $rOrig); |
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$gNew = static::bit(($amount * ($gOrig - $gBlur)) + $gOrig); |
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$bNew = static::bit(($amount * ($bOrig - $bBlur)) + $bOrig); |
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$rgbNew = array("red" => $rNew, "green" => $gNew, "blue" => $bNew, "alpha" => 0); |
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$image->setRGBAt($x, $y, $rgbNew); |
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} |
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} |
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} |
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return $image; |
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} |
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protected static function bit($val) |
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{ |
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if ($val > 255) { |
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return 255; |
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} |
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if ($val < 0) { |
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return 0; |
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} |
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return $val; |
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} |
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} |
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geekwright /
XoopsCore25
