To be clear, here is a downsized version of the original you are referring to:
This looks like a clear case of high black level with a reddish tint. Let's see.
Yup, the black level is (.307, .071, .032). Just correcting for that alone yields this:
The darkest part is now black and the lightest white. It still looks somewhat washed out and with a reddish tint. By adjusting black to the darkest of the left and bottom of the lens and the white balance to the reflection off the prism, we get:
All that was done here is expand the range from (.420, .118, .027) to (1.000, .819, .512) to the full black to white range. This proves the original had elevated black level with strong red, and also overall red balance.