This kind of photography is mandatory for every motion picture that involves graphics. Regardless of what color screen you use, shooting in a more uncompressed (or RAW) format will ensure that you have more data in the shot and will likely result in an easier time when you go to key out the footage in post.įor more of the nitty-gritty technical details of green screen vs blue screen, check out this post over at Animation World Network.Green Screen or Chroma Key Photography is a photography style in which we shoot pictures with a solid color in the background so that it becomes easy for the editors to replace that solid background with beautiful backgrounds. The spill of green can result in some messy color work in post that can eat up your time in the edit bay. Often, color correction against a blue screen is cleaner than its green counterpart. Blue screen is also ideal for replicating darker or nighttime conditions. But because of this difference in luminosity, blue also results in less color spill. When to Use Blue Screenīlue screen will require twice as much light as green screen, often a whole f-stop. Any leftover green can blend better into daytime footage, while it’s more challenging to blend green against a darker (or nighttime) background. Green is also an ideal choice if you’re compositing in a ‘daytime’ background. To combat this, ensure that there is sufficient distance between the talent and the green screen background. This can be a nightmare when keying out in post-production. Conversely, because of green’s brightness, it can also lead to more ‘spill,’ meaning the green color may reflect and bleed over on your on-screen talent. The result is that you’ll often be able to pull a clean key with the least amount of noise, and often, without a complicated lighting setup. With modern digital cameras, the green color is processed the cleanest with the most luminance. Here are a few reasons why you should pick one over the other. Once the key is pulled, you’ll be left with nothing but Ewan’s floating head!īut the choice to use green screen vs blue screen extends beyond just the outfit choice of your talent. Here’s an extreme example featuring Ewan McGregor. Using the same colors when shooting is a technique often used for VFX work (motion capture, for instance). If you’re working on a large-scale production against a screen, decide early on the “illegal color range” for any objects in front of the screen! If your talent has green in their outfit and they’re against a green screen background, the green parts of the outfit may be removed when you key out the background. It is imperative that the colors in the foreground of your video are not in the same color range as your blue or green screen. The biggest consideration for blue screen vs green screen is the color of foreground costume, objects, etc. In fact, skin tones do not naturally contain any blue or green, so by using blue or green you’ll have less interference when keying a person on screen. More info on keying in Final Cut Pro X over at Macworldīlue and green are on the opposite end of the color spectrum from red and orange, the main colors in skin tones. This image from Mark Spencer’s FCPX chroma key tutorial shows how this would look in a timeline. The result is the background clip will appear on the deleted parts of the image. This clip is then layered above a solid background clip in a video editing timeline. With modern keying software like Keylight or Primatte, you can select a desired color range (chroma), as well as brightness range (luma), and ‘subtract’ this part of the image from the video frame in your editing application. To understand the basics of why green and blue screens are the most popular choices for chroma keying, we must first understand how a digital keyer works. Image of Spiderwick Chronicles Blue Screen, Creative Commons/Wikimedia Why Are Blue and Green Screens Common for Compositing? Most pro video setups use a green or blue screen background – but why? And what color background is best? Once the solid color background is removed, you can ‘swap’ the background of your footage – a technique that’s used often in news and VFX work. So, while ‘chroma keying’ is the post-production work, shooting on a screen on set is the first part of the process. Chroma keying is the process of shooting video on a solid color background and then digitally removing this background during the editing/post production process. When it comes to digital compositing, how do you know which background color is right for your video project?įor newbies, let’s jump into the basics first.
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