Pentax X90 Operating Manual page 28

Guide Indications
A guide indication for each available button/key operation appears as
follows on the display during operation.
Four-way controller (2)
2
Four-way controller (3)
3
Four-way controller (4)
4
Four-way controller (5)
5
3 button
MENU
Using the Histogram
A histogram shows the
brightness distribution of an
image. The horizontal axis
represents brightness (dark at
the left and bright at the right)
and the vertical axis represents
the number of pixels.
The shape of the histogram
before and after shooting tells
you whether the brightness and
contrast are correct or not, and lets you decide if you need to adjust the
exposure and take a picture again.
Adjusting the Exposure 1p.76
Understanding Brightness
If the brightness is correct, the graph peaks in the middle. If the image is
too dark, the peak is on the left side, and if it is too bright, the peak is on
the right side.
Dark image
26
/
OK
SHUTTER
i
X/
J
I/
(Dark)
Dark portions
Correct image
e-dial
4 button
Shutter release button
9/i button
I button
←Brightness→
(Bright)
Bright portions
Bright image