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A zero or positive value in the control byte means that the
subsequent byte or bytes are non-replicated bytes of data.
The value of the control byte plus one indicates the number
of data bytes that follow. For example, a control byte of 0
means the following 1 byte is literal raster data. A control
byte of 6 indicates that the following 7 bytes are literal
raster data bytes.
TIFF encoding also allows you to include a non-operative
(NOP) control byte, represented by the value -128. This
byte is ignored, and the subsequent byte is treated as the
new control byte.
Note It is more efficient to code two consecutive identical bytes
as a repeated byte. If these bytes are preceded and followed
by literal bytes, however, it is more efficient to code the
entire group as literal bytes.
Raster Graphics 6-23Raster Graphics 6-23