500) { $amount = 500; } $amount = $amount * 0.016; if ($radius > 50) { $radius = 50; } $radius = $radius * 2; if ($threshold > 255) { $threshold = 255; } $radius = abs(round($radius)); // Only integers make sense. if ($radius == 0) { return $image; } // Gaussian blur matrix $matrix = array( array(1, 2, 1), array(2, 4, 2), array(1, 2, 1) ); $blurred = $image->applyConvolution($matrix, 16, 0); if ($threshold > 0) { // Calculate the difference between the blurred pixels and the original // and set the pixels for ($x = 0; $x < $image->getWidth(); $x++) { for ($y = 0; $y < $image->getHeight(); $y++) { $rgbOrig = $image->getRGBAt($x, $y); $rOrig = $rgbOrig["red"]; $gOrig = $rgbOrig["green"]; $bOrig = $rgbOrig["blue"]; $rgbBlur = $blurred->getRGBAt($x, $y); $rBlur = $rgbBlur["red"]; $gBlur = $rgbBlur["green"]; $bBlur = $rgbBlur["blue"]; // When the masked pixels differ less from the original // than the threshold specifies, they are set to their original value. $rNew = (abs($rOrig - $rBlur) >= $threshold) ? max(0, min(255, ($amount * ($rOrig - $rBlur)) + $rOrig)) : $rOrig; $gNew = (abs($gOrig - $gBlur) >= $threshold) ? max(0, min(255, ($amount * ($gOrig - $gBlur)) + $gOrig)) : $gOrig; $bNew = (abs($bOrig - $bBlur) >= $threshold) ? max(0, min(255, ($amount * ($bOrig - $bBlur)) + $bOrig)) : $bOrig; $rgbNew = array("red" => $rNew, "green" => $gNew, "blue" => $bNew, "alpha" => 0); if (($rOrig != $rNew) || ($gOrig != $gNew) || ($bOrig != $bNew)) { $image->setRGBAt($x, $y, $rgbNew); } } } } else { $w = $image->getWidth(); $h = $image->getHeight(); for ($x = 0; $x < $w; $x++) { for ($y = 0; $y < $h; $y++) { $rgbOrig = $image->getRGBAt($x, $y); $rOrig = $rgbOrig["red"]; $gOrig = $rgbOrig["green"]; $bOrig = $rgbOrig["blue"]; $rgbBlur = $blurred->getRGBAt($x, $y); $rBlur = $rgbBlur["red"]; $gBlur = $rgbBlur["green"]; $bBlur = $rgbBlur["blue"]; $rNew = ($amount * ($rOrig - $rBlur)) + $rOrig; if ($rNew>255) { $rNew=255; } elseif ($rNew<0) { $rNew=0; } $gNew = ($amount * ($gOrig - $gBlur)) + $gOrig; if ($gNew>255) { $gNew=255; } elseif ($gNew<0) { $gNew=0; } $bNew = ($amount * ($bOrig - $bBlur)) + $bOrig; if ($bNew>255) { $bNew=255; } elseif ($bNew<0) { $bNew=0; } $rgbNew = array("red" => $rNew, "green" => $gNew, "blue" => $bNew, "alpha" => 0); $image->setRGBAt($x, $y, $rgbNew); } } } return $image; } }