Basics Of Digital Photography

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OverviewPicture ElementsGeneral camera featuresCamera demo and downloadImage editingPicture samples slide show

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Picture elements

Long history of use in image creation

Mosaics in ancient architecturePointillist school of artTextilesPrinting half tone picturesElectronic picture elements (pixels)

6th Century Italian Mosaics

19th C. French Neo-impressionist paintingThe Pointillist School

Image consists of small dots of paintDots (pixels) made with point of brush as small as 1/16 inchDots are unequal in size

Other Pointillist worksGeorges SurratJean VoletM. Rysselberghe

Textile example hand made stitchery

Image Printing ScreenPhoto screen can be course or fineNeed black ink for single colorDots not equal sizeEye reads dots as continuous tone image

Computer Picture Elements (Pixels)36 blank pixels36 colored pixels2 pixel horiz line2 pixel vert line2 pixel diagonalYouve got JAGGIES!

Low Resolution Computer Graphics

Desktop icons are 32x32Pixels, 1024 bytes

Image Resolution and File Size

24 and 32 bit color depth24 bit = 3 bytes (the RGB model)

32 bit = 4 bytes (the CYMK model

RedGreenBlueCyanYellowMagentaBlackExample (CorelDraw)

Parameters of digital image qualityMonitor dot pitchMonitor dots per inchMonitor calibrationScreen resolution settingMonitor sizeImage resolutionColor depth

Digital CamerasAn exploding marketMajor camera makers now producing digitalsEstimates of market to be 50% digital in 2002Wide range of features and prices

Canon Powershot G16 months on market3.3 Mp sensor chipUnder $1000 classMany features of satisfy beginners or experienced usersHigh image quality

Overview of mega-pixel camerasType 1& 2 CF memory cardsFull exposure controlResolution selectionISO selectionBright LCD screenExternal flash hot shoeZoom capabilityLens converters

LCD screen displaysRecord menuPlay menuSetup menu

Image resolution/qualitySmall resolution 640x480Fine compressionIncreases memory capacity

Medium resolution 1078x760Fine compressionGood quality for prints or Net

Large resolution 2048x1576Fine compressionBest quality for prints

ISO SelectionAbility to vary film speed for lighting conditionsISO 50ISO 400G1is first digital to offer ISO 50

Exposure Mode ControlsAuto (point & shoot)ProgramShutter priorityAperture priority Manual setting

Exposure BracketingAllows taking 3 shots at different exposuresBracket can be set in 1/3 stop incrementsExposure range can be set to 2 to +2 stops

- .7 stopNormal exposure+.7 stop

White BalanceWB corrects for different lighting conditionsControls on LCD from rear panel button

Zooming the image in LCDFeature allows close examination of image at 2 levels of zoom to check image details

Macro ModeThis mode allows close-ups to 2.4 inches with normal lens at wide zoomCanon offers a macro lens attachment for closer macro images

Normal modeMacro mode

Play index Provides view of 9 thumbnails on screenJump mode moves 9 thumbnails sequentially

That is all folks, and thanks for watching

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