Description: ------------ I found some issues related to "quality" parameter in Image/Transform/Driver/Imagick3.php class : First of all, the "setImageCompression" method is mistakenly invoked to set Quality, when it should rather be a call to "setImageCompressionQuality" method... Also, I noticed that when generating thumbnails, resulting files are much bigger than corresponding GD picture (same quality parameter) ?!? To solve that, I discovered that a call to Imagick::stripImage() would clean extraneous data... Test script: --------------- Replace : $this->imagick->setImageCompression($quality); By : $this->imagick->setImageCompression(Imagick::COMPRESSION_JPEG); $this->imagick->setImageCompressionQuality($quality); $this->imagick->stripImage();