Thursday, May 13, 2010

Daltonize in Google Chrome

Presenting Chrome Daltonize! as one step towards solving the issue of color-accessibility on the Internet – a Google Chrome extension enabling users to daltonize the image content of websites.  Daltonization is a technique of exposing details to color-blind users, enabling them see what they otherwise would have missed.

Setting up Chrome Daltonize extension:

Color vision deficiency (default is Protanope)
Select option that best describes you; Protanopic (malfunctioning red-cone), Deuteranopic (malfunctioning green-cone), or Tritanopic (malfunctioning blue-cone).
Run at page load (default is false)
By default, daltonization of a page is done by clicking on the browser-action button (it's the sphere icon) on the top-right corner of your browser.  If you want to run daltonize by default every time a new page is loaded, check this box.
Show speed results (default is false)
If option is checked the amount of time it took to process the images is displayed, otherwise, the time is not displayed.
Results of Chrome Daltonize on Ishihara test plates:
The details in the following Ishihara #18 test plate [3] cannot be seen by a red-green dichromat, or can be partially seen, depending on the degree of the malfunctioning cone-cell.  Using the LMS Daltonize algorithm [1, 2], and the CVD simulation algorithm, the following was created:
References:
  1. Françoise Viénot, Hans Brettel and John D. Mollon
    Digital video colourmaps for checking the legibility of displays by dichromats
    Color Research and Application, 24(4): 243-252
    , 1999.

  2. Onur Fidaner, Poliang Lin and Nevran Ozguven.
    Analysis of Color Blindness

  3. Les Daltoniens
    Le test d’Ishihara 

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  3. the simulate feature doesn't seem to work for me (at all - on any webpage). ideas?

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  4. i think what you're doing is fantastic! kudos to everyone that help make this! i personally am not color blind, but i know someone who is, and i couldn't imagine what the world would be like not being able to see certain colors.....sad.

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  5. please make run at page load= true because every time i open a page i have to check this option....

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