Digital Imaging Tutorial

Confused as to the nature of printed images versus video images?
Interested in digital photo editing and need help understanding DPI and resolution?

The Scan Tips site will help answer those questions. Though the site is geared towards scanning images, the author addresses all the questions that surround digital imagery. The site provides a very good introduction to understanding digital images.

In particular he addresses the two means of displaying images: 1) printing 2) video display. He spends considerable time discussing how these two means are different and how they require a different approach.

Topics discussed on the site:

• The First Fundamental Concept
• Video Resolution – How much to scan?
• Say No to 72 dpi – It’s a false notion
• Printing Resolution – Scaling and Resampling
• Finding the Scaling and Resampling Menus
• Printer Resolution – How much to scan?
• Line art and Threshold – Copy and OCR, Printed Text
• Line art and Grayscale
• Scanning for Fax
• Descreen to remove Moiré Interference
• Images in magazines/books/newspapers
• Interpolated Resolution – 9600 dpi?
• Photo Resolution – How much can we scan?
• Image File Formats – Which format?
• Video Boards
• Transparent Media Adapter – 35 mm slides?
• What about Film Scanners?
• Dynamic Range – 24 bit or 36 bits?
• The Search for System Calibration

He also offers a printed book for $24 which goes into more detail then the website. It truly is the best education on digital imaging for the price.