Basics Of Digital Photography
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Transcript of Basics Of Digital Photography
Overview
•Picture Elements
•General camera features
•Camera demo and download
•Image editing
•Picture samples – slide show
Picture elements
Long history of use in image creation
– Mosaics in ancient architecture– Pointillist school of art– Textiles– Printing half tone pictures– Electronic picture elements (pixels)
6th Century Italian Mosaics
19th C. French Neo-impressionist painting
The Pointillist School
•Image consists of small dots of paint
•Dots (pixels) made with point of brush as small as 1/16 inch
•Dots are unequal in size
Other Pointillist works
Georges Surrat
Jean Volet
M. Rysselberghe
Textile example – hand made stitchery
Image Printing Screen
•Photo screen can be course or fine
•Need black ink for single color
•Dots not equal size
•Eye reads dots as continuous tone image
Computer Picture Elements (Pixels)
36 blank pixels 36 colored pixels 2 pixel horiz line
2 pixel vert line 2 pixel diagonal
You’ve got JAGGIES!
Low Resolution Computer Graphics
Desktop icons are 32x32
Pixels, 1024 bytes
Image Resolution and File Size
24 and 32 bit color depth
•24 bit = 3 bytes (the RGB model)
•32 bit = 4 bytes (the CYMK model
Red
Green
Blue
Cyan
Yellow
Magenta
Black•Example (CorelDraw)
Parameters of digital image quality
•Monitor dot pitch
•Monitor dots per inch
•Monitor calibration
•Screen resolution setting
•Monitor size
•Image resolution
•Color depth
Digital Cameras
•An exploding market
•Major camera makers now producing digitals
•Estimates of market to be 50% digital in 2002
•Wide range of features and prices
Canon Powershot G1
•6 months on market
•3.3 Mp sensor chip
•Under $1000 class
•Many features of satisfy beginners or experienced users
•High image quality
Overview of mega-pixel cameras
•Type 1& 2 CF memory cards
•Full exposure control
•Resolution selection
•ISO selection
•Bright LCD screen
•External flash hot shoe
•Zoom capability
•Lens converters
LCD screen displays
Record menu Play menu Setup menu
Image resolution/qualitySmall resolution 640x480
•Fine compression
•Increases memory capacity
Medium resolution 1078x760
•Fine compression
•Good quality for prints or Net
Large resolution 2048x1576
•Fine compression
•Best quality for prints
ISO Selection
Ability to vary “film speed” for lighting conditions
ISO 50
ISO 400
G1is first digital to offer ISO 50
Exposure Mode Controls
•Auto (point & shoot)
•Program
•Shutter priority
•Aperture priority
•Manual setting
Exposure Bracketing
•Allows taking 3 shots at different exposures
•Bracket can be set in 1/3 stop increments
•Exposure range can be set to –2 to +2 stops
- .7 stop Normal exposure +.7 stop
White Balance
•WB corrects for different lighting conditions
•Controls on LCD from rear panel button
Zooming the image in LCD
Feature allows close examination of image at 2 levels of zoom to check image details
Macro Mode•This mode allows close-ups to 2.4 inches with normal lens at wide zoom
•Canon offers a macro lens attachment for closer macro images
Normal mode Macro mode
Play index
• Provides view of 9 thumbnails on screen
•Jump mode moves 9 thumbnails sequentially
That is all folks, and thanks for watching