Shrink by converting to monochrome

Sometimes you want to reduce the size of scanned text. You can convert to Grayscale, or to Monochrome. The fomer looks a little better, though the latter is much smaller. However, when using Monochrome you must pair it with png to get the best size. Some examples

{code}
-rw-r--r-- 1 gattis gattis 436189 2009-10-09 16:02 operations02.gray.jpg
-rw-r--r-- 1 gattis gattis 506138 2009-10-09 15:58 operations02.gray.png
-rw-r--r-- 1 gattis gattis 481175 2009-10-09 14:47 operations02.jpg
-rw-r--r-- 1 gattis gattis 458016 2009-10-09 16:02 operations02.mono.jpg
-rw-r--r-- 1 gattis gattis  68499 2009-10-09 15:42 operations02.mono.png
{code}

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