I really want to create this effect with two coloured lighting. I read this up but I was confused about the gel lighting. Can someone put this effect into simple terms? Thanks in advance.
How to create this effect on a portrait with light of different colors on each side of the face?
2Can you please describe the effect in the title of your question, and more fully in the text, too? Thank you.– mattdmAug 20, 2016 at 16:36
Are you trying to create this in Photoshop without using physical gels on the lights? Or are you willing to create this "in camera" by using gelled lights when you take the picture?– scottbb ♦Aug 20, 2016 at 17:48
1I feel like we have an existing question on a similar multi-colored lighting setup, but I can't find it....– mattdmSep 1, 2016 at 18:28
"Gelling" a light simply means putting a sheet of colored plastic (a gel) in front of the light so the light is tinted. In this case, the light source on one side of the subject's face is purple and the other side is blue, so purple and blue gels were used on the two light sources.
With Strobist type setups, gels are fixed to the front of the flash head in all sorts of ways: holders, velcro, etc. But you do want to be careful not to melt the thin sheet of colored plastic by overheating it.
The other thing you have to be very careful of, when setting up this kind of lighting scheme is to avoid combining the light sources into each other, or the colors will mix (in this case, you'd get blue, purple, and then a purple-blue area), so flagging off (putting blockers on the sides of the lights) the light sources, or using grids can help control spill and narrow the light sources. And you usually have to kill the ambient light (i.e., make sure your ambient/flash balance is all-flash and no ambient--typically, using exposure settings that, without flash, would underexpose by four to six stops).
If you plan on coloring a background, using a black backdrop will create a more saturated color than using a grey or white one.