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--TEST-- Test Tutorial, levelizeImage --SKIPIF-- <?php $imageMagickRequiredVersion=0x675; require_once(dirname(__FILE__) . '/skipif.inc'); ?> --FILE-- <?php $blackPoint = 50; $whitePoint = 100; $gamma = 2.2; function levelizeImage($blackPoint, $gamma, $whitePoint) { $imagick = new \Imagick(); $imagick->newPseudoimage(300, 300, 'gradient:black-white'); $maxQuantum = $imagick->getQuantum(); $imagick->evaluateimage(\Imagick::EVALUATE_POW, 1 / $gamma); //Adjust the scale from black to white to the new 'distance' between black and white $imagick->evaluateimage(\Imagick::EVALUATE_MULTIPLY, ($whitePoint - $blackPoint) / 100 ); //Add move the black point to it's new value $imagick->evaluateimage(\Imagick::EVALUATE_ADD, ($blackPoint / 100) * $maxQuantum); $imagick->setFormat("png"); $bytes = $imagick->getImageBlob(); if (strlen($bytes) <= 0) { echo "Failed to generate image.";} } levelizeImage($blackPoint, $gamma, $whitePoint) ; echo "Ok"; ?> --EXPECTF-- Ok