Key Technical Issues in Educational Computing: Digital Imagery and Storage Solutions
This document explores significant technical issues in educational computing, focusing on digital imagery concerns related to storage options and resolution settings. Key topics include various memory types (e.g., Compact Flash, SD/MMC Cards), resolution definitions and impacts (e.g., megapixels, color depth), features influencing image quality (e.g., optical vs. digital zoom), and practical guidance for choosing between digital and traditional film. Practical examples are provided with camera models such as Nikon N80 and Canon Elph S230 to illustrate key points and considerations for educators and students.
Key Technical Issues in Educational Computing: Digital Imagery and Storage Solutions
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Presentation Transcript
W220 – Technical Issues in Educational Computing Digital Imagery
Concerns • Storage (film) • Resolution • Features • Flash • Tripod socket • Movie mode • …
Memory • Compact Flash • Compact Flash Type II • Smart Media • xD Picture Card • Memory Stick • Memory Stick Pro • CD-R Disk • SD/MMC Card • Floppy Disk
Resolution • Mega pixels • >1 • 1 • 2 • 3 • 4 • 5+
Resolution • Color Depth • 8 bit depth – 256 hues • 24 bit depth – 16 million hues • 72 DPI • number of pixels displayed by a computer screen • X Y dimension • Absolute size of the image • 8 x 10 @ 300dpi = 4 x 5 @ 600 dpi
Optical Photographic technology Image magnified before reaching the CCD Digital Electronic technology Image magnified after reaching the CCD Electronic cropping Appears to enlarge image Loose pixels (resolution) Zoom – optical versus digital
Speed (to the desktop) Resolution Convenience Tonal / Color range Sharpness Color reproduction Purchasing Cost Per Image Cost Flexibility Digital Film Digital Film Film Film Digital? Digital Film Digital versus Film
Hands on… • Nikon N80 • Canon Elph S230 • Sony Mavica • Canon ?
