thank you philip for your answer, until now i am actually using the convert-function of imagemagik. my intention to use the thumbcreator functions of konqueror was to also generate movie and textfile previews with it. my problem is that i do not know any c++. i saw that in other forums some people asked the same question. but i could not find any answers to it. would it be possible to use the mentioned class in a simple shell command ? e.g. ThumbCreator(source file,width,height,destination file) best regards ___________________________________________________ . Account management: https://mail.kde.org/mailman/listinfo/kde. Archives: http://lists.kde.org/. More info: http://www.kde.org/faq.html.