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will 8bc filter damage math in 32bpc comp

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Jon Merrifieldwill 8bc filter damage math in 32bpc comp
by on Apr 22, 2011 at 5:28:10 pm

I am completing VFX composites for a feature film in AE (CS5). The final output is DPX LOG sequences to be used for a DI and film out. I am using Pete O'Connell's advice for converting the orig DPX LOG footage (converted RED using RCX) thru the Cineon converter and comping in 32bpc which will be removed or reconverted LIN back to LOG when final. Some of the work requires effects that are 8 or 16bpc like liquify for example. Will this negatively affect the color space of my comp when converting and rendering back out to LOG DPX? I have avoided any non-32bpc effects until today.
Thank you very much for your time and professional knowledge.


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Walter SoykaRe: will 8bc filter damage math in 32bpc comp
by on Apr 22, 2011 at 5:55:03 pm

[Jon Merrifield] "will 8bc filter damage math in 32bpc comp"

Yes.

If you must use an 8 or 16bpc effect, check out the HDR Compander effect [link] (and the associate animation preset "Compress-Expand Dynamic Range").

Walter Soyka
Principal & Designer at Keen Live
Motion Graphics, Widescreen Events, Presentation Design, and Consulting
RenderBreak Blog - What I'm thinking when my workstation's thinking
Creative Cow Forum Host: Live & Stage Events


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Jon MerrifieldRe: will 8bc filter damage math in 32bpc comp
by on Apr 22, 2011 at 7:47:06 pm

Walter, Thank you very much. Now I feel foolish for not discovering this in the guide myself.


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Darby EdelenRe: will 8bc filter damage math in 32bpc comp
by on Apr 22, 2011 at 8:18:56 pm

When using the HDR Compander i recommend adding a levels effect after the first instance of the HDR Compander. This will give you a histogram to check the compression of your colors. You should try to make sure that the histogram shows no (or very few) colors outside the 0-1 range.

Darby Edelen


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Erik LindahlRe: will 8bc filter damage math in 32bpc comp
by on Apr 24, 2011 at 11:24:17 am

Is this only per element in a comp or for the entire comp? Say I work in 32bpp, add two layers. Layer 1 is the 32bpp video, layer 2 is a graphics file I apply the "fill" filter to (8bpp effect). Will layer 1 or filter affecting layer 1 and 2 get downsampled to 8-bit precision or will only media in layer 2 be affected?

------------------------
Erik Lindahl
Freecloud Post Production Services
http://www.freecloud.se


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Todd KoprivaRe: will 8bc filter damage math in 32bpc comp
by on Apr 24, 2011 at 11:52:40 pm

Erik: The 8bpc effect throws away all of the extra precision of the colors that feed into it, but it doesn't do any further damage. The colors of the layer to which its applied will be less precise (and lose their overrange values), but other layers are unaffected.

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Todd Kopriva, Adobe Systems Incorporated
Technical Support for professional video software
After Effects Help & Support
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Erik LindahlRe: will 8bc filter damage math in 32bpc comp
by on Apr 26, 2011 at 10:49:28 am

Cool, as I thought it worked.

------------------------
Erik Lindahl
Freecloud Post Production Services
http://www.freecloud.se


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Walter SoykaRe: will 8bc filter damage math in 32bpc comp
by on Apr 25, 2011 at 4:30:17 pm

[Darby Edelen] "When using the HDR Compander i recommend adding a levels effect after the first instance of the HDR Compander. This will give you a histogram to check the compression of your colors. You should try to make sure that the histogram shows no (or very few) colors outside the 0-1 range."

This is a great suggestion! Thank you, Darby.

Walter Soyka
Principal & Designer at Keen Live
Motion Graphics, Widescreen Events, Presentation Design, and Consulting
RenderBreak Blog - What I'm thinking when my workstation's thinking
Creative Cow Forum Host: Live & Stage Events


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