V1.02
Thom Hogan’s Complete Guide to the Nikon D300
Page 267
How to Interpret Histograms
Much has been written about how useful it is to see the
exposure histogram on the color LCD after taking a shot.
However, not everyone understands exactly what he or she is
seeing.
A simple histogram’s horizontal axis ranges from dark valued
pixels (0=black) at the left to bright valued pixels (255=white)
at the right. The horizontal axis shows the
luminance
channel
and does not tell you anything about the individual Red, Blue,
and Green channels.
This part of the screen is the histogram:
The vertical axis is the number of pixels in the image with a
particular luminance value. The vertical axis scales with the