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Pentax Optio A20 User Manual

Pentax Optio A20
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50
Taking Pictures
4
A histogram is a graph showing the
brightness of an image on the horizontal axis
and the number of pixels on the vertical axis
(distribution chart of the brightness). The
histogram will help you detect the brightness
of the image you have taken. For instance,
the graph peak tends to appear on the left
side for a darker image, and the graph peak
tends to appear on the right side for a brighter
image.
In general, when the exposure meter of your
image is well-balanced, the graph peaks
tend to appear in the middle.
On the contrary, when the exposure meter gets imbalanced tending dark and bright
without showing a neutral brightness, the peaks appear not in the middle but on
both sides.
Using Histogram
Number of pixels
Brightness
(Dark) (Bright)
Dark Neutral Bright

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Pentax Optio A20 Specifications

General IconGeneral
Megapixel10 MP
Sensor typeCCD
Image sensor size1/1.8 \
Maximum image resolution3648 x 2736 pixels
Still image resolution(s)640 x 480, 1024 x 768, 1600 x 1200, 2048 x 1536, 2592 x 1944, 3072 x 2304, 3648 x 2736
Digital zoom4 x
Focal length range7.9 - 23.7 mm
Digital SLRNo
Built-in flashYes
Camera shutter speed4 - 1/2000 s
Effective sensor resolution1037000 pixels
Compatible operating systemsWindows 98/98SE/Me/2000/XP
Focal length (35mm film equivalent)38 - 114 mm
Focus adjustmentAuto
Normal focusing range0.35 - ∞ m
Super Macro focusing range0.06 - 0.15 m
Macro focusing range (wide)0.12 - 0.4 m
Light meteringCentre-weighted, Spot
ISO sensitivity64, 100, 200, 400, Auto
Internal memory22 MB
Compatible memory cardssd
Maximum memory card size4 GB
Motion JPEG frame rate30 fps
Video formats supportedAVI
Maximum video resolution640 x 480 pixels
Display diagonal2.5 \
Display resolution (numeric)232000 pixels
USB version2.0
Scene modesbeach, Children, Documents, Night, Portrait, Sports, Landscape (scenery)
White balanceauto, daylight, Fluorescent, manual, Shade, Tungsten
Self-timer delay2, 10 s
Product colorSilver
Battery typeD-LI8
Flash modesauto, Flash off, Red-eye reduction
Camera shutter typeElectronic
Weight and Dimensions IconWeight and Dimensions
Depth23 mm
Width88.5 mm
Height54.5 mm
Weight125 g

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