
564 Chapter 16
correction will jump to the next code value up or
down. Enough accumulations of these rounding
errors can result in color aliasing, or banding.
Figure 16.39 A gray graduation before resampling.
Figure 16.40 The same gray graduation after several
re samplings.
The image on the left was subjected to three
consecutive gamma corrections, resulting in
the image on the right, which exhibits notice-
able aliasing and banding, and a loss of overall
smoothness to the graduation.
Noise Reduction (or Sometimes
Amplification)
Noise in images is subjective. The cinematog-
rapher and his ...