Pentax Optio T20 - Manual (Page 50)

Adjusting the Size, Quality Level, Brightness, and Color Tone
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The camera will automatically adjust settings such as brightness and
color tone to capture pictures and movies as optimally as possible. If,
however, you want to use creative effects, you will need to customize the
shooting functions. This section explains the various built-in functions that
can help you to capture better pictures and movies.
Size and Quality Level
Set the size and quality level according to how you intend to use the
pictures or movies (p.49).
Brightness
The brightness (exposure) of a picture is determined by the amount of light
entering the camera lens (aperture) and the length of time the light is allowed
to enter (shutter speed). If the brightness of a picture is not at the desired level,
one solution is to adjust the setting using the EV compensation function (p.53).
The AE metering function is also helpful in allowing you to select the
metering method to measure proper brightness under different shooting
situations (p.55).
When you take a picture in a dimly lit location, using the flash to illuminate
the subject is a basic technique (p.56). But if you want a more natural
feeling and do not want to use the flash, customizing the ISO sensitivity
(p.67) can help produce a properly exposed image.
Color Balance (White Balance)
Use the white balance setting if the color balance of the image is not
pleasing, or if you want to give the picture a bluish or reddish look (p.58).
Sharpness, Saturation, and Contrast
Sharpness, saturation and contrast settings are available in three levels
(p.60) for sharpening or softening the outlines of an image, enhancing its
vividness, and adjusting the image contrast.
Adjusting the Size, Quality Level, Brightness,
and Color Tone