[mcbits]

I'm not quite sure if it works for blue and red or only certain color combinations, but it's possible to create images where an item in the scene is obviously one color, yet the light hitting the eye is another color. The brain automatically adjusts for "that's what a red object would look like in that environment," when the light coming from the photograph is actually blue.

In that way you can have a picture that's "blue red" due to perspective rather than semantics. E.g. the car in the picture is really red and the color of the ink depicting it is really blue. The red is blue.

[redial]

That is interesting, but it is also an answer to a different question. The question is "are there any blue reds?" not "can we see in some circumstances reds as blue?".

[mcbits]

I thought the question was asking whether there are any reds that are blue.

Edit: This isn't as clear as it could be if I was better with GIMP, but it should illustrate the idea. https://imgur.com/a/cRWhdTJ

[redial]

The question is "are" there any blue reds. In other words, regardless of who is watching it, or if anyone at all.

The question is not "can we perceive" some reds as blue.

[mcbits]

There are no blues or reds at all if nobody is watching. Color is a purely perceptual phenomenon relying on properties of the eye and brain.

[redial]

Not true, what we call the color red is an electromagnetic wave with a wavelength between, according to wikipedia, 625 and 740 nanometers.

And if you are looking at a picture on a computer, the computer will call red a pixel with an rgb value of (255, 0, 0) even if nobody is looking at it.

[mcbits]

The light coming from the car in that image would be concentrated around 450-500 nm, not 625-740 nm. Viewed in isolation, that's blue, but in the context of the rest of the image, it is red. The "redness" of the car exists only in the brain of the viewer, which has evolved to produce stablility of color in a variety of lighting conditions.

That's also why RGB monitors display more than three distinct colors. The colors are synthesized in the brain. If we were orbiting a brown dwarf, we might talk about colors within the infrared part of the spectrum as if they were intrinsic properties of light.