LIBRARY: Tutorials Reviews Interviews Editorials Features Business Authors RSS Feed

Using Curves to Simulate Bleach ByPass

Using Curves to Simulate Bleach ByPass
CreativeCOW Adobe After Effects Tutorial


Using Curves to Simulate Bleach ByPass
Filip Vandueren Filip Vandueren
Belgium

©2005 Filip Vandueren and CreativeCOW.net. All rights reserved.


Article Focus:
In this quick tutorial, Filip Vandueren would like to share a technique he uses a lot which in Belgium is called 'etalongage' or color-timing. It's a two step process which gets great results.



The terminology "Timing" is from the old-fashioned way of Film-transfers. I believe the process was something like this: By using separate Red Green And Blue lights and shining them for a specific time onto each frame of the negative, you get different color-balances on the positive print of the film.


So, let's begin. Here's the footage I'll use:


I'd like to change the colors using Curves, but when I try to achieve colorization, the saturation starts to run into it's limits, and you get ugly posterized stuff like this:



The trick is using a "bleach-pass"

Usually a de-saturated version of the footage is overlaid on the original, but I prefer screening the red-channel, not just the gray; you'll see why in a second.


1. The easiest way of doing the bleaching is using the Channel->Calculations-effect with these settings:

  • Input Channel: RGBA

  • Second Layer: Choose the layer you're working on

  • Second Layer Channel:Red

  • Second Layer Opacity:100%

  • Blending Mode: Screen

Here's the result:


The nice thing about using red is that it evens out and de-saturates the skin, but leaves detail in the eyes.

2. Now, when you use curves to reintroduce Contrast and create a new color-balance, you can go from subtle to pretty wild — and clichéd ;-) — color-treatments, but you keep a certain 'believability' in the color-change; just compare these to the 1st and 2nd picture in step 1.





3. Here's a variation with different curves



It's true, my way does lose some contrast and works best on footage that isn't too hot, like the footage I started with.

If the histogram is very white, I mainly correct that in with the RGB curve, achieving a similar thing as Gamma. I can also Clip the whites or Blacks there, so it gives me almost all the control I need with just 2 filters !

Please discuss this technique in the After Effects forum at Creativecow.net



Please visit our forums and view other articles at CreativeCOW.net if you found this page from a direct link.




Related Articles / Tutorials:
Adobe After Effects
Adobe Creative Cloud September 2020 Update: Streamlined workflows that make storytelling easier

Adobe Creative Cloud September 2020 Update: Streamlined workflows that make storytelling easier

The current environment is forcing us to rethink and reimagine so much. Content creators, from broadcasters to streaming services to social video creators, are finding new ways of working that prove creativity and resourcefulness are inherent to the video industry. Adobe's Eric Philpott explores Adobe's developments in response to the ever evolving challenges we face today.

Editorial
Eric Philpott
Adobe After Effects
Makin' Planets! Saturn (with rings and shadows)

Makin' Planets! Saturn (with rings and shadows)

In this video, Graham shows how to make Saturn's rings using Polar Coordinates, then use an Alpha Invert Matte along with a simple expression to cut the rings out.


Graham Quince
Adobe After Effects
Makin' An Eclipse

Makin' An Eclipse

In this tutorial for Adobe After Effects, I use the Circle effect, Fractal Noise, Polar Coordinates and CC Light Rays to create a 2D solar eclipse.

Tutorial
Graham Quince
Adobe After Effects
How To Put Yourself In Any Movie Part 3: Keying Greenscreen

How To Put Yourself In Any Movie Part 3: Keying Greenscreen

Following the huge response to parts one and two of independent filmmaker Cody Pyper's Adobe Photoshop and After Effects tutorial series, "Put Yourself In Any Movie!", here is the truly EPIC series finale, which is the most complete single keying tutorial we've ever seen. It's all here, including Red Giant's Primatte Keyer, Premiere Pro's Lumetri Color Panel, AE's Keylight filter, everything you need to know about curves and levels, realistic blurs, shadows and VFX, and more! Did we mention that this is epic? EPIC!


Cody Pyper
Adobe After Effects
Makin' a 3D Nebula in Photoshop, Cinema4DLite, and After Effects

Makin' a 3D Nebula in Photoshop, Cinema4DLite, and After Effects

Graham continues his space tutorial series, featuring the Orion Nebula

Tutorial
Graham Quince
Adobe After Effects
Motion Tracking in After Effects

Motion Tracking in After Effects

During this short video tutorial, I’ll show you how to apply Track Motion to aerial drone footage


Andy Ford
Adobe After Effects
Free Tablet and Phone Screen Replacement Tracking Images

Free Tablet and Phone Screen Replacement Tracking Images

Here's a giveaway for anyone interested in trying to do a screen replacement for their iPad, iPhone, Tablet or phone.


Graham Quince
Adobe After Effects
Bring Images to Life with Paravent

Bring Images to Life with Paravent

Paravent is a useful script for Adobe After Effects, available for download for a donation or for free, and used to fold and unfold layers in After Effects.


Andy Ford
Adobe After Effects
Creating Fog with Fractal Noise

Creating Fog with Fractal Noise

This is just one quick example of many on how to use Fractal Noise to create fog.


Andy Ford
Adobe After Effects
Utimate Guide to Looping Footage and Compositions

Utimate Guide to Looping Footage and Compositions

Graham Quince, after spotting posts from those new to AE who don’t know about the options, has compiled the utlimate, time-saving, plug-and-play expressions that would take care of loop compositions for you.


Graham Quince
MORE
© 2020 CreativeCOW.net All Rights Reserved
[TOP]