Link Dump: Keying

August 28, 2008

Alright, this one’s going to be really quick because it’s 11:30 in a series of late nights and early mornings and I’m trying to beat the pre-sleep hunger and save it for morning. So, here goes…

We’ve been doing keying in school a lot recently, so while investigating that, I decided to collect resources and share them with you here tonight (did you notice I’m back on schedule? :P). So, first off, Videomaker.com had an article on The Keys To Chromakey, basically a how-to for greenscreening, covering the basic production theory and offering some suggestions for equipment and tools. The ABCs of Chomakeys also looked good. Also, while searching through the site, I discovered their collection of video tutorials I didn’t know they had. Score!

Moving right along… of course I always check out After Effects tutorials, having some sort of fascination with the application, legally owning it myself, and loving the guys who make the tutorials I’ve found, and so I found this very useful tutorial about light wrapping around your greenscreen subject. Breakdown: basically what happens when you shoot something is light from behind the subject will bend around that subject, leaving little traces of the background on the edges of that subject. You’ll notice it the most in silhouette shots, where the edges seem semi-transparent. During a green/bluescreen shot, this happens just the same as normal, only since you’re keying out the blue/green in post, you often key out the egdes or parts of the subject with those shades of blue/green on them. Which is clearly a problem. This tutorial offers some tips on creating a preset to help you with fixing this problem and creating realistic light wrapping based on the new background image you’ve replaced your blue/greenscreen with. Nice long tip there from me… that one’s free :P. Following in the After Effects vein, this was just a cool little note I found for Mac users, getting a color picker while inside the AE interface. It sounds like a great help for motion graphics creators. Less for compositing work, but still a useful tool if you’re on a Mac.

Another AE link is this site, its list of tutorials being somewhat cool, the summer-to-winter effect was pretty decent, and their Hand Scanner and Aurora Borealis tutorials were pretty cool too.

Alright… into the more industry-friendly stuff… Shake tutorials. I found a nice trio of Shake keying tutorials using Keylight, which actually also ships with After Effects now, so some of this stuff might be useful there too. I wasn’t watching in that frame of mind though, so I couldn’t say for sure. All three parts are good, the audio’s just really low, so you’ll have to listen carefully with loud speakers (or headphones). Thanks to CreativeCow.net for those.

On the last – but not least – note of this post, is a new episode from Photoshop For Video about saturating reds in images without exceeding broadcast/video limits. Good stuff.

Enjoy the new stuff, and I’ll be back as always on Sunday with some new showcase stuff for you guys. Happy filmmaking and good luck keying. Send in commenst or questions or test footage if you like, I’d love to see something.


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