Sony DSC-S45 - Manual (Page 11)

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Adjusting the ISO sensitivity
ISO is unit of measurement (sensitivity), estimating how much light an image pickup device
(equivalent to photo films) receives. Even when the exposure is the same, images differ
depending on the ISO sensitivity.
[ISO] adjusts the sensitivity
t page 29
The apparent color of the subject is affected by the lighting conditions.
Example: The color of an image affected by light sources
The color tones are adjusted automatically in the auto adjustment mode.
However, you can adjust color tones manually with [White Bal] (page 29).
High ISO sensitivity
Records a bright image even when shooting in a dark location. However, the
image tends to become noisy.
Low ISO sensitivity
Records a smoother image.
However, the image may become darker.
Color
On the effects of lighting
Weather/lighting Daylight Cloudy Fluorescent Incandescent
Characteristics of
light White (standard) Bluish Blue-tinged Reddish