Green, Blue, and Extremely Portable

One side is green and the other is blue. It stretches so your chroma-key productions have a lightweight, flat background. But it’s a good idea to stretch even more with clips.

Or: chroma-key, anywhere.

It’s amazing how easy portable video production has become. You can shoot high definition video with a smart phone, a tablet, a FlipCam (and similar products), an inexpensive video camcorder, a digital still picture camera… The list goes on.

Most of the time, the recorded video is real life… people in action, scenery, and so on. Sometimes, it’s interesting to explore new creative domains. Often, these explorations involve the placement of people or objects in imagined places, and this is often achieved through a technical miracle called chroma-key.

What can you (and some kids) do with chroma-key? Here’s a step-by-step example that’s fun to watch. (Click to watch the video.)

You know chroma-key: it’s the technology used to place your local meteorologist in front of a digital weather map. The subject performs in front of a green screen, and then, all of the green is (miraculously) dropped out of the image so that it can be replaced with your choice of alternative video. In fact, any color can be used as the chroma-key color, but most often, a deeply saturated green or blue is used because these colors are not (usually) seen in the colors of human skin or hair or eyes. The colored area is usually painted, or created with a cloth stretched very tightly and lit evenly. When using chroma-key, folds and shadows cause difficulty.

With these challenges in mind, I had very high hopes for the FlexDrop2 from Photoflex. The portable package is a big, lightweight fabric disc, not quite a yard in diameter. It sets up with not much more than the flick of a wrist, and opens to a taut five foot by seven foot panel. Very cool.

Mostly, the FlexDrop is flat, but the use of a small clamp here and there is necessary to eliminate all visible shadows and wrinkles. Unfortunately, it’s not a standalone device…it is designed to be attached to a lighting stand or other pipes or tubes (and these are rarely lightweight).

Hands on, FlexDrop2 really works. One person can stand in front of a field of nothing but blue (one side) or green (the other), and then, live or with a good edit application, the chroma-key process can be used to drop out the blue or green and drop in any video still, animation, graphic, or footage. Two people? Hang the FlexDrop2 horizontally. Another good use: as a background for stop-motion animation, but you will need to dress the tabletop surface with an additional green or blue cloth (exactly the same color as FlexDrop2).

At $165, the FlexDrop2 is a nice-to-have, a bit expensive unless you use it often. And, of course, there are less costly ways to make chroma-key happen: buy a cloth and stretch it yourself, paint a wall, etc. But this one is handy, portable, stretches nicely, stores without taking up much space, and does the job in a professional manner. One catch: it’s not so easy to collapse and pack away. This video shows you how to pack it up.

BTW: Thanks to Kristy and to Rebecca for their help with this article.

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