Which file format allows 20% to 50% compression of the original?
-svg
-tiff
-bmp
-cgm

Compression as a TIFF file, suing the LZW algorithm, produces a negligible reduction to 252kbytes. Better results are achieved by saving in Portable Network Graphics (PNG) format, a relatively new file format with a more efficient lossless algorithm which compresses the file to 172kbytes (66%). I hope this helped. I added a link to a book that I received this information from. 
https://books.google.com/books?id=qzw52L7lb-sC&lpg=PA266&ots=hTOXjJTE8C&dq=Which%20file%20format%20a...