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0 pointsOJFord3y ago0 comments

It took me a while to see anything other than resizing - but yes, the larger one is ever so slightly greener to me too (I am colour blind, couldn't see a difference side by side).

And I watched the gif prior to reading your description of the difference - I experience this strange phenomenon sometimes whereby the colour of something (or the presence of different colours) morphs in front of my eyes, after someone describes it or claims that it's there. (Red and green bars on a chart for example might all be the same, then someone says 'blah blah in the second red bar' and all of a sudden I can distinguish them, see the red or green that wasn't there before. Or a bridge in London that suddenly looked green when I was told it was called Green Bridge.) I wish it was easier to learn more about it, because I find that kind of fascinating (and mildly 'scary'!) - must surely mean it's not just about the eyes, but my brain is smoothing over some rough edges as though small red/green differences are assumed to be wrong, but if someone confirms them then the parameters are altered.

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tkgally3y ago· 2 in thread

I’m color-blind, too. I can see only the resizing difference in the gif; the colors look identical to me.

I haven’t ever experienced the reperception-by-suggestion phenomenon that you describe. But I do think that, when I was young, I gradually became a bit better at distinguishing and remembering colors than I had been as a child, perhaps because having been told that I was color-blind made me pay more attention to colors. “Purple” was a mystery to me when I was ten; by the age of twenty, I could usually distinguish it from blue.

Maursault3y ago

I am not color-blind, but there are shades of colors that, depending either on light source, what other colors are around, or just how I'm thinking about what I'm looking at, will switch back and forth. I can pick out purple from violet, but I have had some clothing that will either appear purple or grey depending on how I am thinking about it (really). Similarly, I have a hoodie that is a timber green that at times appears brown, and a pair of corduroys that are brown that at times appear vaguely purple. I am nearly certain these shifting hue effects of the dyes were intended by the manufacturers.

OJFordOP3y ago

It's extremely subtle to me - the bottom horizontal stream gets very very slightly greener when it gets bigger. I noticed it first because the starry swirl thing above it, bottom right of the big black thing, seemed to change shape as though the actual brush strokes were different, bit more of a classic star shape emerges. But it's extremely slight, more like the 'what a colourblind person would see' filtering is imperfect than that I can actually see the original.

mort963y ago

Yeah, sorry about the resizing and shifting. The two images in the article are different sizes (and aspect ratios!), and I couldn't find a good way to fix it up in gimp without either making everything blurry (cubic interpolation) or cutting out rows and columns (nearest neighbor interpolation).

Your description of how you see colors morphing once they're described is interesting! The brain definitely does a whole lot of complex visual processing which we don't notice, such as filtering out the big hole in your retina which nerves go through, and retroactively replacing the memory of your eyes moving with what you see after they've moved. And your peripheral vision is almost entirely grayscale, yet the brain fills in the colors it expects to be there so it doesn't feel grayscale. It doesn't surprise me that when color information is missing due to color blindness, it will fill in the missing color information from other sources.

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