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Tumble is a utility to construct PDF files from one or more image
files.  Supported input image file formats are JPEG, and black and
white TIFF (single- or multi-page).  Black and white images will be
encoded in the PDF output using lossless Group 4 fax compression
(ITU-T recommendation T.6).  This provides a very good compression
ratio for text and line art.  JPEG images will be preserved with the
original coding.