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User quotes:
Congratulations for your web page!!!!!! This is the first time that I have seen clearly, with real images and not with the Ishihara test, the limitations of my color blindness. I see the pictures of Earth and hats really identical, so the simulations are very very good. As soon as I can I will show my wife those examples because they must be very clarifiying.
-Octavio L. C.
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Try Daltonize on Your Image Files

Select amount of correction to apply:
Low:   Medium:   High:
Or- enter your own values below...
Red/Green Stretch factorAmount to scale the Red/Green color axis by. 1=No scaling
Luminance correctionAmount to scale the red/green color axis by. 0= No correction
Blue/Yellow correctionAmount to correct using the blue/yellow axis. 0= No correction

Image file:


  • 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!

Privacy policy. Contact: Last modified 2017-Jun-14 09:04 GMT.