I know this works from the command line: % convert ''svn-book.pdf[0]'' first-page.png The above example will only process the first page of a PDF. This is great for creating a thumbnail of the ''cover page'' of a PDF, and it avoids the CPU load required to process a huge file. (in this case, the svn-book.pdf is 300 pages) How would I accomplish this using the magick_file_column? To use the command line as an example, the ''svn-book.pdf[0]'' isn''t really and argument such as -size 120x120, etc. How can I pass that [0] to rmagick when I''m processing a PDF? Paul