Sony DSLR-A200 Guía Del Usuario

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How to check the histogram
A histogram is the luminance distribution 
that shows how many pixels of a 
particular brightness exist in the picture.
When the image has a high-key or low-
key portion, that portion is flashed on the 
histogram display (Luminance limit 
warning).
The exposure compensation will change 
the histogram accordingly. The right 
illustration is an example.
Shooting with the exposure 
compensation on the positive side 
brightens the whole picture, making the 
entire histogram shift to the bright side 
(right side). If the exposure compensation 
is applied on the negative side, the 
histogram will shift to the other side.
Both ends of the histogram show a high-
key or low-key portion. It is impossible to 
restore these area with a computer later. 
Adjust the exposure if necessary and 
shoot again.
Number of pixels
Dark
Light
Luminance
R (Red)
G (Green)
B (Blue)
Flashing