Digital Imaging

Agenda

• Definitions• File types• Basic concepts• Questions & Answers

Computers can’t work with analog data.They do not recognize physical properties.

To have images mean anything to a computer, the electrical impulses must be converted into digital data—a series of 1s & 0s.

So, if we describe an image digitally - as raw numbers - we can work with the image in a computer.

Problem: it isn’t quite as simple as feeding numbers to the computer - the numbers have to be correct, if they are a little bit off, the image will look very wrong.

Pixel

DPI

Resolution

• A grid of dots that are assigned or mapped to a given physical or unit space typically measured in inches or centimeters.

Resolution

Raw

Compression

File Types

• TIFF• JPEG

• PNG• GIF• Other

Resources

Woodruff Resources: The Complete Guide to Digital Imaging. Joel Lacey Call Number: TA1637 .L313 2001Adobe Photoshop Elements : a visual introduction to digital imaging Andrews, Phillips Call Number: T385.A49 2002 The Scanning Workshop Romano, Richard Call Number:TK7882.S3 R66 2002 eb (E-Book)

Additional Resources:Blognosticator by Brian Lawler (College Professor, Graphic Arts Consultant) http://thelawlers.com/Blognosticator/

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