Which is better, a chroma key green screen made from cotton or polyester?

Cotton is the easiest to work with. It has a matt finish and can easily be ironed or steamed to remove wrinkles. Just remember that cotton is a natural fiber thread that is dyed chroma key green. The consistency of the chroma key color in a natural fiber is not as consistent or accurate as a chroma key made from 100% polyester thread.

Polyester is easy to work with. Polyester has a more reflective finish and cannot be as easily ironed to remove wrinkles. It can be easily steamed and often will be stretched onto a frame or backdrop system. Polyester is a man made fiber and the chroma key green is a base component. The chroma key color is more accurate than a chroma key made from 100% cotton.

In other words, a true chroma key green screen backdrop made from cotton or polyester will work. What it really comes down to is easy of use, durability of the fabric and your budget. For ease of use and budget, go with cotton. For the highest accuracy in color and durability go with polyester.