Tool to resize,compress file size from 100kb to 50 kb.

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http://ubuntuforums.org – Hi, I would like to resize a series of files (jpg images) to half of its size in terms of quality and file size - not in terms of scale. On a Google search I have found this ImageMagick tool, but this seems to resize the pictures only in terms of scale. I need to resize them, because I would like to save them as PDF file using the gscan2pdf package. But when I feed this tool with the 114 jpg picutres, ( file size of 100kb each) I get a PDF of about 160 MB, which is far to much. What can I do ? Any suggestion might be useful. Thank you for your help ! Claus (Hardware)