Color Blind Tool

Being red/green color blind myself and therefore having researched this and discussed with other color blind people here's how I develop sites...

Take a screen grab of whatever you design - load it into a graphics program and convert it to monochrome. If there are texts on backgrounds etc that are difficult to read then they are the ones to work on because it all comes down to contrast for color blind people.

It may be glaringly obvious to you that you have yellow on a green background - to a red/green color blind person it's all of a mush...

So I wouldn't worry about all those filters and stuff at that page - just do the monochrome test - it works every time.

And remember, 8% of all men are color blind. That's a HUGE audience that most web designers don't cater to. More of them spend their time making their stuff Mac-compatible than color-blind compatible