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