[bluechair]

I’ll highlight a note from the developer:

Sim Daltonism lets you see through the eyes of someone with a color blindness. While the colors shown are a good approximation of what a color blind person would see, you should not expect them to be perfect.

Everyone has his own perception of colors that differs slightly from other people, and color blindness are often partial at different degrees. More importantly, cameras do not have the same spectral response as cones in your eyes, so the simulation has to make some assumptions about the frequency composition of the colors.

I’m colorblind and haven’t found a simulator that comes close to what it’s like for me. This app doesn’t do it either.

[adamgordonbell]

I'm also color blind, red green, but not sure how you expected to be able to judge it.

You can't see how the app affects colors in absense of your own color blindness to compare.

[egypturnash]

What would “close to what it’s like” entail exactly?

Would it mean that when you look at a simulation of the effects of your colorblindness, you see zero change from the unaltered view?

Or would it mean that it looks absolutely nothing like what you see because it’s transforming the base image by clamping the input colors to what you can see, and stretching that decimated color space out over the entire range of normal sensitivity?

Sometimes I suspect that the range of color qualia the human mind experiences is the same regardless of what actual color receptors one has; the sensation we call “red” is assigned to the lowest end of the input scale, regardless of whether or not the lowest end is at the normal wavelength, and that every filter that just removes color and provides a duller image is doing completely the wrong thing. But it’s a much simpler transformation to implement.

(I think the key to checking this would involve violently clashing colors. Or a way to make someone start growing new cone cells in their eyes.)

Also if you have had entirely too many conversations with the normies about “what does it look like for you” then please just ignore this, my SO is partially colorblind and gets that a lot!

[swiftcoder]

> Would it mean that when you look at a simulation of the effects of your colorblindness, you see zero change from the unaltered view?

Ideally, yes. Although it's unlikely to match any one person's exact colour vision.

If you look at filtered images side-by-side, say from this collection on bored panda[1], to me the deutran images and the normal image are pretty much indistinguishable, while the protan image is close but slightly too green.

> Or would it mean that it looks absolutely nothing like what you see because it’s transforming the base image by clamping the input colors to what you can see, and stretching that decimated color space out over the entire range of normal sensitivity?

That's how most "colour blind filters" look in practice, yes. I don't think a lot of folks are setting up the transform correctly (or they are just straight-up using a colourblindness preview filter as if it were a colourblindness correction filter).

[1]: https://www.boredpanda.com/different-types-color-blindness-p...

[fisherjeff]

I have always felt the same way - this article at The Verge is the only thing I’ve ever thought has gotten close:

https://www.theverge.com/23650428/colorblindness-design-ui-a...

[Terr_]

Part of it may be the display technology, rather than what the software thinks should look right.

Those RGB pixels are chosen and tuned to trick a certain homo sapiens baseline setup of chemical sensors neurological weighing of sensor inputs. Light from natural source is dramatically more-varied.