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Compositing Secrets Everyone Can Use, Pt 5: Brightness

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CreativeCOW presents Compositing Secrets Everyone Can Use, Pt 5: Brightness -- Adobe After Effects Tutorial


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The first challenge to understanding the nature of brightness in compositing starts with remembering that we're not actually seeing color at all, but rather something of an illusion that appears to us as color! Join longtime VFX artist, editor, software developer, and business owner Simon Ubsdell for Part 5 of the best look behind the technology of compositing that you've ever seen, as he takes a look at the math behind brightness, and how to apply that to the compositing toolsets in your favorite editing, compositing, and color grading applications.



This time I'm looking into the maths of the various ways for defining the brightness of an image (Value, Lightness, Luminance, Luma, etc) and why it's useful to know about that. Plus how to build some fundamental image processing operations based on what we're discovered in this tutorial, including Saturation, Brightness, Contrast and Unsharp Mask.

Of course there's an even more interesting dimension to that when we consider our human colour vision system. We're not "seeing colour" but instead we have receptors that respond to specific wavelengths and that information is muxed by our brains in much the same way that a display device does it, you could say.

The thing that fascinates me is that initially we were only able to "see" green, followed shortly by red, and then very much later by blue. Which explains why our receptors for blue are less sensitive - they're literally less evolved.

It's very hard to imagine not being able to see what we think of as the "full spectrum" of colour but it's only a relatively recent development - and of course it's still very partial indeed. We only see what we can see.










Simon Ubsdell
Simon Ubsdell
Hi, I'm Simon Ubsdell, Creative Director of TOKYO PRODUCTIONS, a UK-based boutique creative shop specializing in movie trailers, sales promos and TV Spots for the independent film sector both in the UK and across Europe.

I've been a film and video editor for over 30 years as well as being involved in motion graphics, sound design and mixing, music composition, visual effects and compositing, 3D modelling and animation, and colour grading, not to mention writing, directing and producing, and most recently, software development.

I am also a developer of plug-ins for the video post-production market having released a range of successful and acclaimed products both under the Tokyo brand and as Hawaiki with Robert Mackintosh.

Comments

Re: Compositing Secrets Everyone Can Use, Pt 5: Brightness
by Deepak Kumar
Can Anyone Tell Me How To Composite Key Light Fill Light And Rim Light Passes(Open Exr) in After Effect. I Added Keylight Pass into Screen Mode Over Diffuse Pass After Applying Occlusion.. It Burned Out if I Multi ply It Darken Out..I Actually Want To Know What Is Right Procedure To Combine Light Passes in Right Order and Blending Mode.


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