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Thank you for the Vischeck upload site. I work as a graphic designer and illustrator preparing information panels. Many years ago I realised that I should choose my colours carefully, as so many people exhibit some degree of colour blindness. I talked it over at that time with a friend who had problems with red/green, and we concluded that I should assume these colours are just shades of grey. Since then I've checked my work by printing stuff off as greyscale or photoopying it to see that the tones are sufficiently distinct. I was thrilled today to discover your site. It allows (I assume) somewhat more accurate checks and, best of all, it suggests that my 'shades of grey' theory was reasonable for the time.
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Color Vision Simulator Examples

Vischeck's color vision model allows you to simulate how the world looks to people with various sorts of color deficiency. As you can see from these examples, 'color blindness' is really a misnomer- most 'color blind' people do in fact see colors! The colors seen may be different than those seen by someone with normal color vision. Also, people with color deficiencies may see certain colors (like red and green) as very similar, while someone with normal color vision sees them as quite dissimilar. (Complete color blindness does occur, but is quite rare.)

For more information on color deficiencies, see Alex Wade's recent article from Planet Medica.

The world.

How the world looks to a person with a red/green color deficit (deuteranopia).

How the world looks to a person with a blue/yellow color deficit (tritanopia).

earth from 
space image earth, 
deuteranope earth, 

Some colorful hats.

As seen by a person with deuteranopia.

As seen by a person with protanopia, another form of red/green deficit.
image hats, deuteranope hats, protanope

This is an Ishihara plate commonly used to check for red/green color blindness

This is what a red/green color-blind person might see. Note that the digit (3) is practically invisible.

original image as 
seen by a deuteranope

People with color deficiencies may have difficulty distinguishing certain colors (e.g., a red/green color deficiency means that reds and greens are more difficult to distinguish). But as this photo demonstrates, many other colors are just as distinguishable to a person with a color deficiency as to someone with normal color vision.

Poppies and cyclamen.



original image protanope poppies tritanope poppies

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