Image Processing Reference
In-Depth Information
Fig 4.6
Night city scene with a shutter speed of ½
second.
Fig 4.7
Night scene with a shutter speed of 1 second.
Fig 4.8
Night scene with a shutter speed of 5 seconds.
Since we are on a tripod, the shutter speed can be quite long because
the camera is stable. Any movement in front of a long shutter exposure
smears across the frame and anything that does not move remains sharp
and in focus. This is the same principle used in light painting. So, if you
want to heighten the contrast in your time-lapse photography, then shoot
at longer shutter speeds on a tripod. The moving images streak and the
stable images remain focused, giving the contrast you need. The longer
the shutter speed, the longer is the streak effect. This has the effect of
smoothing out the action in contrast to the more staccato appearance of
most stop-motion images, which are sharp and unblurred frame to frame.
You have to close your iris down for the longer shutter speed in daylight or
use a neutral density filter or the Big Stopper filter by Lee Filters to darken
the image. You have to open up the iris for night events to maintain a good
overall exposure in the dark.
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