Digital Photography

By Mike Volker

What is Digital Photography?

• A form of Photography that uses digital technology to make images of subjects

• Replaced film

UsageCan be displayedPrintedStoredManipulatedTransmittedArchived

All without chemical processing

How do I digitize an image?Scanning a conventional image to the

computerScanning 35 mm Slides to the computerMoving to the computer from a memory

cardCopying from a Web Site

Digital and Analog SystemsDigital is a system that uses discrete

(discontinuous) valuesNon-digital (analog) uses a continuous

range of valuesDefinition: comes from the word digit

and digitus which means finger. Used for discrete counting

Sensors and Storage Image Sensors

Read the intensity of lightMemory Devices

Store the digital image information Nearly all digital cameras use built-in

and /or removable solid state flash memory

Quality of ImagesPixel Count (megapixels)Lens QualityCapture medium – CMOS, CCD, FilmCapture format

RAW, TIFF, JPEG, etc. (digital) 135 film, 120 film, 5x4, 10x8 (film)

Processing Digital and or chemical processing of

negative and print

Pixel CountsNumber of pixels for a given maximum

resolution Product n = w x h

Image 1600 x 1200 Yields 1.92 megapixels (192,000 pixels)

Presidential Portrait First official U.S.

Presidential Portrait to be taken with a digital camera.

Majority of Professional news photographers use digital cameras

Usage of photographsSnapshot PhotographersCell Phones (inferior images)EmailWorld Wide Web (www)Digital picture framesCourt proceedings