Orange is what you are

Photoshop is your friend. Certainly, you'll say, the camera doesn't see as we do, it alters colors, etc. That is besides the point. Once you are looking at the colors on the screen, if they make up a good tromp l'oeil to you (and my gosh, isn't a photo almost as realistic as, say, a photo?) then there is something to learn from it.

The color prejudices of the XIXth century have been substituted by the color prejudices of the more recent years. Now everybody sees purple shadows, even when they aren't there, and everyone sees complementary colors in form shadows even when none are around. It is good to have a mechanical, innocent machine to tell you honestly what it sees. Take a photo, spot a color in photoshop, then make a patch with it. Working in HSV, then place side by side its maximum chroma at constant value. Sometimes you'll be very surprised. One of the first things I was taught in art class was that "yellow and black make green". I wondered why for a long time. No, it's not some weird effect of either yellow pigments or black, most blacks have a surprisingly flat spectrum, the fact is that the "fact" is untrue. Yellow and black doesn't make green, it makes dark unsaturated  yellow, as it should. But what does yellow look like at low chroma? Yes, it looks "green". The fact is that we get very confused at low chroma, if we don't have the training. If you do this little photoshop analysis as a habit you'll find that in most pictures of humans all you get is orange and red, none of the famous greens or purples. An amazing lot of seemingly purple and green shadows are nothing but honest unsaturated oranges. Orange is what we are. 

Note: on the picture I have also placed patches of maximum value at constant chroma and null-chroma patches. This last one is not useful in HSV mode, as value in HSV doesn't correspond to what you get by squinting. You should use LAB mode if you want to examine value (or lightness).