Using Gels to Correct Colour Balance

Here are a series of tutorials to assist you when you find yourself in difficult lighting conditions.

If you show up at a corporate photo shoot and their offices are lit with standard florescent bulbs, you will end up with a very green background. No one wants to look at the green cast of a florescent light. So you had better use a gel.

What’s the difference between using a green gel and no gel?

Read full article here 

 http://profoto.com/offcameraflash/how-to-light/whats-difference-using-green-gel-no-gel/