Color Constancy
Most people have a visual function called color constancy. It's the reason a white wall still looks white in the orange glow of a sunset, and a white shirt still looks white under the yellowish light of an indoor lamp — even though the light hitting your eyes is anything but white. The brain quietly identifies the ambient light, subtracts it, and returns the surface to its "correct" color. The wall stays white. The shirt stays white. The correction runs automatically, beneath conscious awareness, all the time.
As far as I can tell, that function is either absent or very weak in me.
Look at the photos above. The blue lines were drawn around one thing only — the areas of each image that read, to me, as blue-tinted. Nothing was measured or compared first. I looked at the photo, and those were the regions that stood out as blue before I had time to think about it.
A few things about how the circles were drawn matter here. In the photo of the cat looking up, blue shows through almost the entire body, but some patches read stronger than others, and those are marked more heavily. In the photo of the child, only cool tones were circled — warm tones exist in the same image but were left out on purpose, simply because today's focus was blue. None of this required searching for a pattern. The color inside each line is, as far as I can tell, the same color as the line itself.
This isn't something that only happens with photographs held up for inspection. It happens with ordinary daylight. Morning air has a color to me, and it isn't the same color as midday air, and evening is different again — not metaphorically, but as something I can point at. A wall painted plain white is never actually white in my experience; it carries whatever light is being cast onto it by its surroundings, and I see that cast color directly, as though it were the wall's own color rather than something layered on top of it.
For most of my life I assumed this was just what "seeing" was — that everyone registered color this literally, this automatically. I have since come to think that what I'm describing may be related to the absence, or at least the weakness, of color constancy: the process by which most visual systems adjust a surface's perceived color back toward what it "should" be, filtering out the tint being cast on it by ambient light, so that a white wall keeps looking white under a sunset. I don't seem to run that correction. What reaches my eyes is what I see — the physical color of the light in that moment, unadjusted.
About the proof
I'm aware that these photos, on their own, don't settle anything. They're images I chose and marked myself, so it's fair to wonder whether I studied them slowly and traced the colors carefully before circling them. Static pictures can't rule that out.
But that's not how it happens. The marking isn't the result of analysis; it's just what I see when I look. And this points to why a still image is the weaker form of evidence. For most people, color constancy is doing its work in the background — the visual system quietly corrects a surface back toward the color it "should" be, holding a white wall white even under a colored light. That correction is largely automatic and hard to switch off, so pulling the raw, uncorrected color out of a scene reliably and repeatedly is something most people would find difficult, however carefully they looked.
So the honest test isn't the photo — it's immediacy. Show me any photograph I've never seen, without warning, and I can point to the color shifts in it straight away. If it would help to verify that, I'm willing to do it live: pick an image, and I'll say what I see as I look at it, unrehearsed and unedited. The photos here document the pattern; the demonstration is where it actually holds up.
