Color

What's the big deal about color?

Web designers need to make sure that the use color to display information is not the only method used to display information on the web site. Information displayed with just the use of color prohibits people with deuteranopia (red/green color deficit), or tritanopia (blue/yellow color deficit) from visually seeing the information that may not be in plain text elsewhere.

How do I fix this problem?

Just make sure that all of your images, graphs, or tables that display color also display the information in plain text format.

Below are examples of how end users who are color blind may view web sites that depend on color alone to transmit information:

This is the Earth	This is how the world looks to a person with a red/green color deficit (deuteranopia).	This is how the world looks to a person with a blue/yellow color deficit (tritanopia).


This is an Ishihara plate commonly used to check for red/green color blindness	This is what a red/green colorblind person might see. Note that the digit (3) is practically invisible.

More examples:	Protanopia hats, unable to see red.	Deuteranopia hats, unable to see green.
Normal hats.	Protanopia hats, unable to see red.	Deuteranopia hats, unable to see green.

Normal poppy flowers.	Protanopia poppy flowers, unable to see red.	Tritanopia poppy flowers, unable to see blue.