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William Edwards
Light Illusion
on Jun 19, 2012 at 8:22:25 pm

Anyone ever had experience with light illusion with the gamma curve change for Canon? The point of it is to change the gamma curve of the footage coming in to the camera so that you have more information in the highlights and the shadow. Bringing the footage into color, it looks like the footage has that, but that the gamma curve has changed and flattened out the color that was recorded, so now I'm actually missing color information that was already there. Then in highlights, the camera seems to have just made up information, putting bring yellows and blues in other areas that would normally be white (or at least closer to white), like the eyes and teeth.

I don't see the point in using this gamma curve, now that I am working with images the skin looks off and salmony, etc.. Unless I'm missing some balancing feature in Resolve? I've tried playing around with the gamma curve, to no avail. There are grey cards that I will have soon of each scene, but somehow I don't think it will help too much.

I'd post photos if I had permission. The link to the gamma curve is:

http://www.lightillusion.com/canon_curves.html

And it was with CW-02.


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Steve Shaw
Re: Light Illusion
on Jun 20, 2012 at 3:11:55 pm

Hi William,

As we have discussed separately, the Gamma Curves are monochromatic in operation - they have no ability to alter colour in themselves.

The only way for colour to be altered is if additional camera settings have been adjusted, or if there is some form of colour non-linearity within the camera, causing colour shifts if/when the gamma is adjusted.

The gamma curves have been used in many, many projects with great success. See http://www.lightillusion.com/canon_endorsments.html for some user comments and projects.

Unfortunately, it sounds like you may have a problem with the camera used.


Steve Shaw
LIGHT ILLUSION
http://www.lightillusion.com

THE ART & SCIENCE OF DIGITAL IMAGING


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Robert Houllahan
Re: Light Illusion
on Jun 20, 2012 at 5:40:14 pm

In my experience with shooting and coloring the Canon 5D (mk2 and mk3) with curves installed (both LI and Tech) the big limiting factor is that the camera is just not a very good video camera. In video mode they are noisy in the blacks and clip very easily due to the very narrow latitude. So you may be having trouble that is due to the additional camera setup issues or the limits of the camera with the scene that was shot.

-Rob-

Robert Houllahan
Director / Colorist
Cinelab Inc.
http://www.cinelab.com

MAHC-PRO 6-Core 3X GTX285 20Tb SAS Wave Panel Panny 11UK SDI Plasma. Light-Space CMS + Hubble


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Sascha Haber
Re: Light Illusion
on Jun 21, 2012 at 7:13:39 am

Agreed..5D aka post production nightmare.

A slice of color...

DaVinci 8.2.1 OSX 10.7.2
MacPro 5.1 2x2,4 24GB
RAID0 8TB
GTX 470 / Quadro 4000
Extreme 3D+

ICA Instructor
http://www.icolorist.com/Sascha.html


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Margus Voll
Re: Light Illusion
on Jun 21, 2012 at 8:17:37 am

+1

feels total you know ... in most cases.

specially low light

--

Margus

http://iconstudios.eu

DaVinci 8.2.1 OSX 10.7.3
MacPro 5.1 2x2,93 24GB
GTX 470 / Quadro 4000
Multibridge 2 Pro


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Teo Rižnar
Re: Light Illusion
on Jun 21, 2012 at 6:28:10 pm

+1!
Done some c300... big difference!

+1 for Steve Shaw and Light Illusion services! Tools are very powerful and Steve is the best support I have ever invested!

Color grade reel:
Cofounder of http://nuframe.si postproduction


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Craig Harris
Re: Light Illusion
on Jun 21, 2012 at 7:01:50 pm

[Teo Rižnar] "+1 for Steve Shaw and Light Illusion services! Tools are very powerful and Steve is the best support I have ever invested!"

Totally agree with you guys about the Canon!
And also agree re: Steve Shaw. He is one of the most helpful and knowledgable people regarding colour science.

Craig


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Steve Shaw
Re: Light Illusion
on Jun 24, 2012 at 8:46:33 am

Hi Robert, it is true the Technicolor Gamma Curve does indeed reduce the camera dynamic range significantly, which is a real problem.

The LI curves do not do this.

The difference is outlined on the EOS Gamma Curve page of the LI website, and is well worth understanding before using the Technicolor curve as in my experience it does indeed cause real problems!

See: http://www.lightillusion.com/canon_curves.html

Cheers, Steve


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Robert Houllahan
Re: Light Illusion
on Jun 28, 2012 at 12:23:55 am

The camera never had any dynamic range to begin with so any reduction is pretty bad.

-Rob-

Robert Houllahan
Director / Colorist
Cinelab Inc.
http://www.cinelab.com

MAHC-PRO 6-Core 3X GTX285 20Tb SAS Wave Panel Panny 11UK SDI Plasma. Light-Space CMS + Hubble


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Steve Shaw
Re: Light Illusion
on Jun 28, 2012 at 6:47:04 am

Indeed!

It's why I made sure the Light Illusion curves do not reduce the data range at all, unlike the Technicolor curve.

And thanks for all the nice comments ;o)

Steve


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