• Create BookmarkCreate Bookmark
  • Create Note or TagCreate Note or Tag
  • PrintPrint
Share this Page URL
Help

Chapter 1. Digital Camera Raw: Exploitin... > Exposure and Linear Capture

Exposure and Linear Capture

One final topic is key to understanding digital capture in general, not just digital raw. Digital sensors, whether CCD or CMOS, respond to light quite differently than does either the human eye or film. Most human perception, including vision, is nonlinear.

If we place a golf ball in the palm of our hand, then add another one, it doesn’t feel twice as heavy. If we put two spoonfuls of sugar in our coffee instead of one, it doesn’t taste twice as sweet. If we double the acoustic power going to our stereo speakers, the resulting sound isn’t twice as loud. And if we double the number of photons reaching our eyes, we don’t see the scene as twice as bright—brighter, yes, but not twice as bright.


PREVIEW

                                                                          

Not a subscriber?

Start A Free Trial


  
  • Creative Edge
  • Create BookmarkCreate Bookmark
  • Create Note or TagCreate Note or Tag
  • PrintPrint