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FRITZ SCHNEIDER PEACHAM CYBERNETICS
Introduction To Digital Photography
I - Basics
Photography is not new
15th Century19th Century
20th Century
21st Century
“Camera Obscura”.
Tintypes, Daguerreotypes, etc.
Film, paper, wide-spread use.
Digital, electronic transmission.
Human Vision
Focuses on part of scene
Adjusts rapidly to light
Continuously flits around
Limited color rangeColor lost in low light
Basics of Photography
SubjectLensImaging
surfaceImage storageImage
retrieval
()
Film Photography vs. Digital
SubjectLensFilmDevelopingDarkroom magic?Printing
SubjectLensSensorMemory CardPostprocessingPrinting or Display
or e-Mail or…
How Photographs are used
Film To make small prints
to pass around To make large prints to
display To make slides to be
projected
Digital To display on a screen To send as e-mail To share on the
Internet To build web sites Occasionally to print
out
Economic Differences
Film Digital
Initial cost Moderate Getting cheaper
Taking pictures
Must buy film and developing
Free!! Take all you want!
Image display
Must pay for prints (even if blurry) or own a slide projector.
Need a computer
Characteristics of a Digital Camera
Lens qualitySize: Cell Phone vs. Pocket vs. Long Zoom vs.
SLRMemory type: Internal, SD, XD, Memory stickResolution in megapixelsZoom rangeStabilizationUser interfaceBattery life
How many Megapixels?
On screen? 1024 x 768 = .79 MPFinest printing is 300 dpi, the resolution
limit of the unaided human eye.
More allows you to crop it and still have detail.
Bigger pictures take longer to save and need a larger memory card.
Picture Size
At 150 dpi
At 300 dpi
4 x 6 0.54 MP 2.16 MP
8 x 10 1.8 MP 7.2 MP
Sources of Information
Magazines (but they are often out of date)Friends experience (not opinion)Reviews
www.dpreview.com Imaging Resources
Ignore the salesman!
Basics of Photography
CompositionFocusExposure
My Pet Peeve
Here we are in …
Why are you taking the picture?
To prove I was thereTo tell a storyBecause it’s beautiful
Composition: single subject
Vs.
Composition: Rule of Thirds
vs.
Composition: Lead the Eye
Composition: People add interest
Composition: Frame the subject
Focus: Depth of Field
• Wider aperture (f/2.8) has less depth of field
• Telephoto has less depth of field
Exposure
The camera has limited range. It does not see what you see.
Washed out highlights
Lost shadowdetail
Exposure: Special Conditions
Spot metering settingFill flashCheck White BalanceHalf-press the shutter
releaseReduce exposure for
snow, sunrise, etc.
Battery Life
If you have one, use the eye-level viewfinder as much as possible: the screen uses power
Turn off flash, be aware of red-eye featureCarry a spare battery