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22

Professional film productions use neither only green nor only blue for chroma keying, but switch between both depending on the scene. Each can only be used when there are no objects of the same colour in view, otherwise it takes extra work to un-remove these objects. Blue and green are the usual colours because the human skin, which is what will almost ...


11

What sorts of fabric/material give good results? Both general tips and specific examples/links are helpful. Great Resources for tips on lighting and materials: http://provideocoalition.com/index.php/alindsay/story/greenscreen_primer_part_1/ http://rebelsguide.com/forum/viewtopic.php?t=2432 Underexposure (not lighting enough) is your biggest enemy, ...


10

Here's what I used for my setup. Fabric/Material The main thing is to find a material that is very green. Walmart sells (at least in Maine) a very green cotton fabric that works well ($9 for 3 yards). I've tried materials that are a lighter green, but without success. One thing you have to watch out for is large wrinkles, which will quickly ruin the ...


7

Summary: Green screen work is not trivial, the quality largely depends on technique and good lighting, and at least enough space for doing the work you suggested. It does require software although iMovie bundled in most MACs has a chroma key effect (the software that allows you to composite your subject with whatever background you want including maps, other ...


6

From this green/blue screen guide: "Green chroma screens have become more and more popular in recent years, largely because green provides a brighter color channel that tends to have less noise than the blue channel. The relative brightness of green makes it a bad choice for shooting blonde hair though, which is a lot easier to key against blue ...


5

Me and my friend made one for a video project. What we did is took a white bed sheet and just painted it with basic green paint. It becomes a stiff starched fabric texture, which works well for hanging it on a wall. To light it, We used just work lights (3 100watt bulbs + unknown wattage) to light it. The lights we used were like this: We just had to play ...


4

Jonas Hummelstrand has a great guide over on his blog - General Specialist that details out a bunch of tips for it (including descriptions and pictures), I'd recommend checking that out. Ultimately the #1 key is lighting - you have to maintain a smooth and consistent lighting job on the backdrop so that the camera "sees" a consistent blue/green free from ...


3

Assuming the lighting is solid, you should be in good shape. I haven't used the keying features of iMovie, but I can give you a few tips for After Effects. I'll defer to any power users of AE's keying functionality to chime in with more specific advice. First, you'll probably want to start with the Keylight plugin (from The Foundry). It should come bundled ...


3

This won't be a full answer to your question, but LearningDSLRVideo has a few clips about DIY greenscreen--more from a shooting/software standpoint, than the physical setup standpoint, though. How to Key DSLR Green Screen DSLR Green Screen Test DSLR Green Screen Test with Premiere CS5


2

I've heard green table clothes from a dollar store work very well. You can stack them to make them more opaque if you like, and the lighting is more important than the material anyway.


2

I haven't tried chroma keying in Final Cut Express, but I'm pretty sure it depends on your needs and workflow. If you use Premiere for editing movies than AE should be more integrated. Yet, if you really want to get awesome results and have some spare bucks, I'd say you look at some plugins. After all neither AE nor FCE is specialized in chroma keying. ...


2

I've reflecmedia chromakey with good results using a DSLR for both stills and video, producing great easy to key files. Reflecmedia Pop up screen We plan to use this as part of our DSLR HD Video DIY Greenscreen Training course at United By Photography.


2

The Lord of the Rings used green screen. That's the last behind the scenes I've seen, however I can't imagine it being 'most' if that's the case. Looking at the wiki article there are a couple that use blue but if you think about it I imagine it all comes down to what the actor is wearing and if there are any sets pieces involved. Green may be best for ...


2

Working at this level, your best bet is probably to use a DSLR and use one of the hacks available to use them as a webcam via USB. Consumer web-cams use a very small sensor which makes it virtually impossible to get any kind of meaningful background blur. You really need the large sensor of a DSLR to best accomplish what you are looking to do.


2

Practical or most effective? Green Screen work demands the following optimazation points to have it be effective. flat even lighting, no hot spots, no dark spots. no shadows, no reflections, the lighting has to be bight enough to register the green correctly, aka no noise. Additionally, to help avoid hot spots, plan on a fresh drywall/plasterboard for ...


2

If you have a Mac, download "Cam Twist." It offers reasonable live keying, and it can even put you as picture in picture. If you use the right browser, I.e. Firefox with the Google Hangouts plugin necessary for hangouts, "Camtwist" will just be an option in the list of cameras. Download it here.


2

Depends on what your definition of good green screen is. In terms of free software to do green screen well...Only one that I can even think of that does keying is Da Vinci Lite which is free from blackmagic's website. It is pretty complex and pro based, but with a little searching around you might find what you want. I am not sure if you can technically ...


1

What you're looking for is a difference matte. (Not to be confused with a Color Difference Key which is similar to regular chroma key.) It can certainly be done, though you should know that difference mattes are fairly temperamental. The way it works is by finding the difference between an image and each frame of video, and removing anything that's the ...


1

While not a direct solution, AVISynth supports creating a mask from a Chroma key using ColorKeyMask. You can then use that mask to blend the two layers together by using Mask on the top layer and then Layering them together. You could then just feed files in to the script and use FFMPEG or something similar to write out the frame stream from AVISynth. ...


1

Fake it. Use your preferred compositing application to turn down the exposure value over a specified region. For example, if you're talking about a round spotlight affecting a flat region, create an appropriately shaped ellipse, feather it to taste, and turn down the exposure. If instead you're talking about volumetric lighting (like shining a light ...


1

What you're talking about is essentially a negative light. (There's a scene in the Simpson's where Moe doesn't want his fancy customers seeing Homer and the guys, so he unscrews a lightbulb and it casts negative light over them, leaving them in total blackness.) Unfortunately, they don't exist in real life. So your options are: Light things in such a way ...


1

I've got another idea, but it's a little kooky. You light the WHOLE SCENE with spotlights - the fewer the better. On the key spotlight, you add a gel that has an opaque black circle on it. Then as you move that around, that section of darkness will pass over parts of the set/props/actors. For a more focused spot, you could use a bright digital projector ...


1

Actually, your best bet is to use a PCIe or USB 3.0 HDMI input card, like a Blackmagic Intensity, which will take the clean HDMI output of many high quality cameras (e.g: a Nikon D600 or D800, a Canon C100 or C300, etc.) and make it available to other apps on your computer. This is what professional productions do for green screen work to ensure they're ...


1

Wattage has nothing to do with achieving natural lighting. The amount of diffusion and placement does. More light is ALWAYS better because it results in more signal to the camera and more options as far as ISO, aperture and shutter speed. Nothing you setup with artificial lights (particularly on your budget) will come close to the level of the sun on ...


1

It depends, you can typically adjust a tolerance for the level of removal. If the colors of green are closer than the next nearest color, you should be fine, if not, then you would have to do two keys, though I would expect you should be able to stack two layers to get the necessary transparency. (Basically keying over a keyed image, since the result of a ...


1

@filzilla: once again, awesome advice. I would add Suggestion 3: With the space you're describing, you may be limited to tighter shots; I'm thinking head and shoulders with a graphic above a shoulder, or perhaps a virtual studio image in the background. What I have in my kit for similar setups is a collapsible greenscreen: ...


1

Looking at "behind the scenes" videos from Game of Thrones, it uses both colors in turns. So yes, both work, you just pick the one that works in the situation you are filming in at that point.


1

While AE has a chromakey plugin in the box, I have good experience with: http://www.redgiantsoftware.com/news/featured/KeyingSuite11/ There are several tutorials on there website, and this gave me the best results. Of course, your footage is the key


1

After Effects is well know as a finishing software. The best chroma key plug-in I saw in A.E. was keylight. Very nice full controls, to handle even color/light correction of borders key. I don't know if keylight is avaliable for FCE. Maybe the only benefit inside FCE is rendering time. Real tests can talk a lot more. My vote goes for After Effects.



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