Out Gamut Error
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Mixing Light Story Contact Mixing Light Login Log Out ML 0318 :: RGB Gamut Errors Part 1: A Broadcast Colorist's Nemesis Insights Library:prevallnext Author(s):Robbie CarmanType:ArticleDifficulty:BeginnerLikes: 3Skills Used: TheoryCategories: Monitoring, Scopes, Technique, Theory, VFX & Grading, Workflow, Working Faster An Annoying Spec that Broadcast Colorists Must Adhere To Imagine this: You've composite gamut error color graded an hour of programing for a big name network or production company. You've worked your
Illegal Colors Broadcast
butt off making fabulous grades and of course making sure that the video signal - since this is a broadcast show - was perfectly how to fix gamut error legal. As you graded you made sure the signal wasn't too bright or dark, and that saturation was in check. Maybe you even used a ‘broadcast safe' filter or effect somewhere in your pipeline to just catch any stray illegal pixels.
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You did fantastic work, and the client is exceedingly happy! You render the show, ship it off for delivery and go have a pint rewarding yourself for a job well done. The following week your client calls (you're thinking victory lap!) and tells you that there have been some things flagged in QC. Not one to worry, you ask them to send the QC report over as you're confident most of the issues are probably audio problems or something else that's not really your concern. As you scan down the report there they are - they almost jump off the page - RGB GAMUT ERROR (HIGH, RED) 01:13:23:18, there is another one RGB GAMUT ERROR (LOW,BLUE) 01:14:36:18! Dang!!! Has this ever happened to you? We've talked quite a bit in MailBag episodes and at conferences Team Mixing Light has spoken at about RGB gamut errors. These pesky QC flags can be infuriating, and ultimately feared, as they can be hard to clear up if you're not sure exactly what they are and how to go about fixing them. The first thing to understand about RGB Gamut Errors? Every broadcast colorist has been there! You're not a bad colorist! Trust me, depending on the network and QC engineer, RGB gamut errors might not even be anything the eye can see - but only an automated alarm on a set of scopes can! In this Insight, which is Part 1 of a two part series on RGB gamut errors, I want to take a closer look at what these errors are, how you can monitor for them and some broad strategies on how you can fix them. Part 1 is an article, but in Part 2 with the background knowledge in place, I'll show you in a video how to use the techniques I outline below for dealing with pesky RGB gamut errors in your own projects. Let's jump in. So What Is An RGB Gamut Error or Excursion? I'm sure you und
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