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Started by Andy600, January 24, 2014, 06:05:11 PM
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Quote from: Andy600 on July 15, 2014, 09:19:00 PMOnce you match the default ACR output gamma it really shows the color separation
Quote from: Andy600 on July 14, 2014, 10:06:37 PMThe PFE luts are film gamma so will look a little dark. You can push up the shadows in a node before the PFE to rectify or add a Soft Curve lut. BTW, you can use Alexa log-C luts from the ARRI Lut Generator too
Quote from: marekk on July 19, 2014, 05:29:11 PM.. I know I talking about two different products but.. what is the best way to go from Cinelog-C to Osiris LUTs ?
QuoteWe also have an ACR version of Cinelog-C coming that uses ACR for the log transform and a lut for colorspace.
Quote from: timbytheriver on July 19, 2014, 06:28:24 PM@Andy600 I am very excited about this!
Quote from: Andy600 on July 19, 2014, 03:31:35 PM@mosafar - Ok, that's easy. I will describe it using clip nodes to apply the luts ...
Quote from: Andy600 on July 19, 2014, 03:31:35 PMDoes your monitor let you select an output profile (Rec709, sRGB etc) or can it use luts? For video, you should really be monitoring in the colorspace you intend to output to and your monitor should be calibrated as well as possible....
Quote from: morsafr on July 19, 2014, 07:55:18 PMThank you so much Andy, the result is impressive, very realistic colors + the benefits of Cinelog-C Just one complementary question: what to change in the workflow if I want a sRGB output gamma instead of REC709?I have several preset modes on my DELL U2711. I'm using the preset mode called "Custom color" to calibrate the monitor to its native gamut (perfect for photography).I also noticed a preset mode called "sRGB". Should I switched to it, create a new ICC profile with my i1 Display Pro and use this combination as my starting point for Resolve (and switching back to the other preset mode/ICC profile for Lightroom)?Thank you so much for taking the time to answer all our questions!
Quote from: Andy600 on July 19, 2014, 05:43:36 PMTBH this is a minefield. It all depends on what source gamma and colorspace those luts were designed for and their interpretation of it. I don't have the Osiris pack but I see it comes with log and Rec709 flavors. I presume this is input gamma!?. If the log versions expect a Cineon log input you should be able to use those but it might expect VisionLog input. You may be better off getting Cinelog-C into Rec709 gamma using the Rec709 output lut and use the Rec709 Osiris luts. Results will also depend on the input colorspace so you may also need to add the Rec709 or sRGB gamut lut before the Rec709 output lut but you might also get some nice/unexpected results using Prime RGB or Prime Cine RGB. I will have a proper look at their luts soon and make some Cinelog-C conversion luts if necessary. I would do it now but I'm tied up with getting the new website ready for the Cinelog-C release.
Quote from: marekk on July 19, 2014, 08:42:09 PMThere is a special lut for Cinelog 2.0 to convert footage to Alexa Log C. Is it possible to create conversion lut for Cinelog-C (>Alexa Log C)?
Quote from: Andy600 on July 19, 2014, 09:07:03 PMThe Log-C formula is really only useful for the Alexa and it's 15+ F-stops of DR. Log-C is actually based on Cineon but converting to Log-C will be wasting a lot of space. The only real difference between Cinelog-C gamma and Log-C is in the scaling. Cinelog-C is scaled to work better on lower DR cameras (up to 13.5 f-stops) but has the same black and white points. You can even use normalized Alexa Log-C luts if you like . Basically, you already have it with Cinelog-C + some 'Alexa'esque' color tone and color separation!
Quote from: marekk on July 19, 2014, 09:15:18 PMThx Andy I'm not a color grading expert I would like to simply add some color effects to my footage I'm trying to figure out how to achieve the same look with Cinelog-C as with Cinelog 2.0 -> Arri Log C -> Rec709 -> OSIRIS Luts
Quote from: Andy600 on July 19, 2014, 03:31:35 PM@mosafar - Ok, that's easy. I will describe it using clip nodes to apply the luts Shoot your chart, making sure it is evenly lit and not directly reflecting the light source. Try to set the white balance as accurately as you can.Load your shot into resolve but DO NOT alter white balance at this stage. (Set it to custom but don't change anything yet)....
QuoteJust got a little more testing to do then I'll send you the Cinelog-C ACR pack
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