Nokia RM-51 Service Manual page 216

RM-51
Nokia Customer Care Camera module troubleshooting
Figure 163 Noisy image taken in +70 degrees Celsius
Phone display
If the display contrast is set too dark, the image quality degrades: the images may be very dark depending on
the setting. If the display contrast is set too bright, image contrast appears bad and "faint". This problem is
solved by setting the display contrast correctly.
Basic rules of photography (especially shooting against light)
Because of dynamic range limitations, taking images against bright light might cause either saturated image
or the actual target appear too dark. In practice, this means that when taking an image indoors and having, for
example, a window behind the object, the result is usually poor.
Figure 164 Image taken against light
Flicker
In some occasions a bright fluorescent light may cause flicker in the viewfinder and captured image. This
phenomenon may also be a result, if images are taken indoors under the mismatch of 50/60 Hz electricity
network frequency. The electricity frequency used is automatically detected by the camera module. In some
very few countries, both 50 and 60 Hz networks are present and thus probability for the phenomenon increases.
Flickering occurs also under high artificial illumination level.
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