Understanding Resolution for Video Notes
· --HD video has two resolutions: 1080 and 720 HD
· -- 1080=1920x1080 Pixels in size, while
720=1280-720 Pixels in size
· --Megapixels of a camera have nothing to do with
the resolution of the video
· --1080-2 Megapixels
· --720-1 Megapixel
· --1080 and 720 both look good on an HD TV set
· --If you are doing effects then higher resolution
with more pixels is advantageous.
Choosing Video Frame Rate Notes
· --Video is generally shot at 30 fps.
· --Standard for the 1080 HD video is 30-24
· --Film is usually 24 fps.
· --The brain associates 24 fps to the “film look”.
Understanding the Challenges of Shutter Speed
· --Slow shutter speed for photo shows blurred
action.
--1/30 a second is slowest shutter speed for
video.
· --30 fps @ 1/30 ps is filled completely with
images. No gaps.
· --Eg: 1 second of film using 30 fps and 1/1000 per
second as shutter speed.
--This means 970/1000 of that second would be
blank.
--This puts a huge gap in the video causing
the action to look stutter or chatter.
·
Shooting with high shutter speed does allow you
to look @ still frames of a video. ( Eg. if you were looking for details in the
image.)
· --Usually 1/30-1/90 are standard.
· --You can get away with using 1/120 per second if
action is not too fast.
Getting
the Right Exposure
·
--Important to know how to check your exposure--Tuned with Manual exposure
--Exposure gage is on the scale at the bottom of
screen
--Click up and down to get right exposure—the
lightest spots blink if overexposed, but does not blink if it is underexposed.
· --You can also use the histogram to adjust
· --Really bright conditions require small f-stops
and the opposite for dark situations.
· -- Also you may use a neutral density filter to
make the scene darker
· --If you need it lighter or darker you must change
the ISO
· --Most cameras today have anything between 400-800
ISO
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