Flash gels are thin pieces of colored plastic that you can place over your flashgun, studio strobe, or any other artificial light source to modify the color of the light. (Actually they don't always have to be colored - we'll look at some neutral flash gels at the end of the article).
The reason they are known as gels is because they were originally made from gelatin. Plastic is a lot more long lasting, cheaper, and easier to use, so you're unlikely to find any flash gels still made from actual gelatin today. In this article we'll look at how you can use flash gels for balancing flash with ambient light, creative use of gels for colored lighting effects, how they can be used for reducing the light power, and creating softer lighting.
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