A kind of compression algorithm which replaces sequences

("runs") of consecutive repeated characters (or other units of

data) with a single character and the length of the run. This

can either be applied to all input characters, including runs

of length one, or a special character can be used to introduce

a run-length encoded group. The longer and more frequent the

runs are, the greater the compression that will be achieved.

This technique is particularly useful for encoding black and

white images where the data units would be single bit

pixels.