Pitney Bowes J640 - Manual (Page 168)

Determining a Method
You can use one of two methods to map out your graphic
image:
Hexadecimal
Method The dot sequences are segmented into
Binary numbers, and then converted to
Hexadecimal numbers.
A graphic using gray-scaling, several
slanted lines, or several vertical lines
typically translates more efficiently with
Hex Representation.
Run Length
Encoding Method The dot sequences are segmented into
black and white strings within a row. The
total count of each white string is
converted to a lowercase letter,
corresponding to numeric value. The total
count of each black string is converted to
an uppercase letter, corresponding to
numeric value. This method is more
complicated, but can reduce imaging time
for graphics that contain repetitive rows of
dots.
A graphic with horizontal lines or very few
white-to-black borders typically translates
more efficiently with Run Length Encoding.
The most efficient encoding method depends on how
complicated your graphic image is and whether or not imaging
time is a concern. You may want to experiment with both
encoding methods to get optimal performance.
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Chapter 9. Creating Graphics
9-3