[HN Gopher] Review of Open Source Color Blindness Simulations
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       Review of Open Source Color Blindness Simulations
        
       Author : nburrus
       Score  : 49 points
       Date   : 2021-11-09 13:12 UTC (9 hours ago)
        
 (HTM) web link (daltonlens.org)
 (TXT) w3m dump (daltonlens.org)
        
       | brianmcc wrote:
       | Thing I wrote about my own colour blindness a few years back, for
       | anyone here who's never really dug into it before:
       | 
       | https://mcconnellsoftware.github.io/colourblind-in-software-...
        
       | Finnucane wrote:
       | I have deuteronopia (basically see almost no green), and to my
       | eyes, the blocks marked Marchado, Vlenot, and Brettel are nearly
       | indistinguishable from the original, but the Coblis blocks are
       | not as close. I can see a difference.
        
         | nburrus wrote:
         | Similar for me with protanomaly. I can see a small difference
         | for Machado, Vienot and Brettel (the most saturated red becomes
         | green-ish), but the difference is more significant with Coblis
         | V2, and pretty much just broken with Coblis V1.
         | 
         | To be fair part of the failure of CoblisV1 could be the lack of
         | sRGB/gamma correction, but none of the implementations I found
         | online had it.
         | 
         | If you want to play a bit more with the simulations of Brettel
         | / Vienot / Machado this article has more images:
         | https://daltonlens.org/evaluating-cvd-simulation/
        
           | mason55 wrote:
           | I wish the original article had sliders on the images at the
           | end like the Ishihara patterns do in your link!
           | 
           | It's interesting that you see differences in those images
           | with protanomaly; with my deuteranomaly I see pretty big
           | differences in the images in the OP but playing with the
           | sliders in your link it comes back as severity 0.9 (i.e. I
           | can only ever see numbers if the severity is at max).
        
         | mpetroff wrote:
         | That's to be expected since the Coblis methods, particularly
         | the v1/ColorMatrix version, are known to be very inaccurate.
         | Unfortunately, it's usually the top search result for
         | "colorblindness simulator," which leads folks with normal color
         | vision who try to check for color vision deficiency
         | accessibility to conclude that the images they're checking are
         | accessible in cases when they're not.
        
       | skinkestek wrote:
       | I remember myself testing the colorblindness tool in Gimp 15 or
       | so years ago and concluding they were useless since there was no
       | difference between the images with or without, hehe.
       | 
       | Wasn't until a few years later that I realized I was severely
       | affected I think.
       | 
       | (As for why the obvious explanation eluded me I think it must be
       | because compared to my brother who could help in the garden
       | because he couldn't see the fruits we were supposed to pick I
       | have very good colour vision.)
        
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       (page generated 2021-11-09 23:00 UTC)