Digital Photography By Mike Volker

What is Digital Photography? A form of Photography that uses digital technology to make images of subjects Replaced film

Usage  Can be displayed  Printed  Stored  Manipulated  Transmitted  Archived  All without chemical processing

How do I digitize an image?  Scanning a conventional image to the computer  Scanning 35 mm Slides to the computer  Moving to the computer from a memory card  Copying from a Web Site

Digital and Analog Systems  Digital is a system that uses discrete (discontinuous) values  Non-digital (analog) uses a continuous range of values  Definition: comes from the word digit and digitus which means finger.  Used for discrete counting

Sensors and Storage  Image Sensors  Read the intensity of light  Memory Devices  Store the digital image information  Nearly all digital cameras use built-in and /or removable solid state flash memory

Quality of Images  Pixel Count (megapixels)  Lens Quality  Capture medium – CMOS, CCD, Film  Capture format  RAW, TIFF, JPEG, etc. (digital)  135 film, 120 film, 5x4, 10x8 (film)  Processing  Digital and or chemical processing of negative and print

Pixel Counts  Number 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 photographs  Snapshot Photographers  Cell Phones (inferior images)   World Wide Web (www)  Digital picture frames  Court proceedings