Color Management

The same RGB values interpreted differently by each device's color space
Even though it is impossible to perfectly match all colors on different devices, you can use color management to ensure that most colors are the same or similar enough so they appear consistent.

The devices throughout your workflow use different methods to produce color. These methods are often based on different color models and as a result, the devices operate in different color spaces. Your computer monitor produces color with light and operates in an RGB color space. Your desktop printer produces colors with inks or dyes that work in a CMYK color space. Some colors can be viewed on a computer monitor that cannot be printed on desktop printer or printing press. Likewise, some colors can be produced with inks that cannot be displayed on a monitor.

Even when two devices use the same color model to produce color, they will have different color spaces. For example, a CRT monitor and an LCD monitor both use RGB to produce colors. However, because both use different means to display color, the range of color (color space) of both monitors would be different. The CRT monitor would display a specific red value differently than the LCD monitor.

Even two monitors of the same brand and model frequently display the same color differently. It's nearly impossible for two devices to be completely identical, given the limitations of manufacturing and materials. Go to an electronics store and look at a wall of television monitors. Each monitor displays colors differently.

Monitors change with age like ourselves.
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Cache:
Wrong image? Running out of disk space? Can't stop your browser from loading an out-of-date page or an image? Your browser taking longer to exit? Your favorite Java applet is misbehaving? Clear your browser's cache.

Gamma:

http://www.cgsd.com/papers/gamma.web.html

America On-Line:
By default, America On-Line compresses web graphics to speed downloading of web pages. While this can be desirable this image compression can cause side effects such as images appearing blurry or with dark bands and associated text rendered unreadable.
LINK: http://webmoxie.com/AOL/

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