Is it possible to describe a color, without using another color for reference?

Y’know what’s interesting (to me, anyway)? When I looked at that Ishihara plate, I immediately saw the number “8” and not “3”, the latter being the actual digit represented. I scanned and then re-scanned the entire page, and only then did I go on to read the captions. Only then did I learn the figure was of a “3” and not an “8”. When I looked at the plate again, I clearly saw the “3”. I no longer see the “8” (which never was actually there), even if I try.

Funny how that happens…

It looked like an “8” to me too at first. To be fair, it’s a very slanted “3” with the curves swooping close to the center. Looks a bit like an “8”.

Let’s just all be grateful that traffic signs are not rendered as green blobby dots on a background of red blobby dots. Not since the bad old days anyway.

Ok…y’all can release your pent-up breath of anticipation in an dissapointed sigh.

Mrs. Honeydew says she has no idea what variety of color-blindness she has, other than it being relatively obscure. She says she also doesn’t know the ratio of comparison between her spectrum and normal and she must’ve just arbitrarily grabbed at some example number in hopes of wooing me with her freakish abnormalities. She does think that 15 was probably what she said, not 50. :smack:

The difference between us does seem pretty signifigant though. She is constantly asking me what color something is and reminding me that she can’t tell the difference between this or that when I forget about her unique world view.

She just peeked over my shoulder looking at the examples in Bytegeist’s link, and she says she can see no difference whatsoever between the earths nor the hats in the first two columns. The third column looks different. But…she is able to tell the difference in color between strawberries and the rest of a strawberry plant, so again, we’re back to some unclassified (she’s never cared to know) and non-standard variety of colorblindness.

The hat in the colored example is more day-glow pink than red, so maybe she’s able to distinguish strawberry red, but not day-glow pink. shrug

Yeah, but what’s wild is, in my “mind’s eye”, I “saw” two green conjoined ellipsoids making up an “8”. Obviously, my brain “filled in” green where there was only pink. And that image vanished as soon as I apprehended the fact that it was inaccurate. To my consciousness, for a moment, pink circles became green.

I have to wonder if people can be trained to see colors that aren’t there. Could the colorblind even be trained to see colors they never have? Could I be trained to be color-blind?

Probably no good answers to those question, but experiences like that give me a tiny thrill whenever they happen. Wonders of the mind and all that.

Describing a color by % of RGB or CMYK is describing it in terms of other colors. Using a triplet like (100%,0%,50%) is just like saying “halfway between red and purple,” except that it’s a lot more precise.

Using hue, brightness, and saturation works, though.