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I wasn't absolutely sure about my color blindness until I found your site. Now I have the confirmation. The color-blind simulations on your site are REALLY accurate, I cannot see the difference between the original and the simulation. Also, the daltonize method would sure be a great thing for maps and technical instructions. Thanks for your good job!
-Ryan B.
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Try Daltonize on Your Image Files

Sorry- the Daltonize ImageEngine appears to be down at the moment. Please try again later.


  • Daltonize accepts most common image formats. However, we recommend that you use PNG or JPEG format for uploading large images as these tend to transfer faster.
  • For PowerPoint slides, you can save all your slides as PNG images with "Save As..." and run Daltonize on each slide.
  • Uploading a large file may take a while - please be patient!

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