Try setting the blur option of ImageMagick(1) directly with the SCALE object(2): 20 = SCALE 20 { params = -gaussian-blur 3 } Tomas Mrozek -- [1] http://www.imagemagick.org/script/command-line-options.php#gaussian-blur [2] http://typo3.org/documentation/document-library/references/doc_core_tsref/4.2.0/view/1/9/#id4431622