
Raster images
This chapter introduces the basic features of the pixel
array. I explain how the pixel array is digitized from the
image plane, how pixel values are related to brightness
and color, and why most imaging
systems
use pixel
values that are nonlinearly related to light intensity.
Imaging
In human vision, the three-dimensional world is imaged
by the lens of the eye onto the retina, which is popu-
lated with photoreceptor cells that
respond
to light
having wavelengths ranging from about 400 nm to
700 nm. In video and in film, vve build a camera having
a lens and a