Understanding File types, Resolution and Compression

Lessons 4 and 5

File types, Resolution and Compression

The "rainbowing" effect, characteristic of over-compression:
(Use mouse to rollover to reveal undamaged image).

rainbowing at 90% compression - not at 30%

6x4 snapshot

original size= 6mb

final size=
20kb

Lesson illustrates
Effect of saving using:
Diferent File types
Different Resolutions
Different Compressions