Return-Path: Received: from atl4mhob04.myregisteredsite.com ([209.17.115.42] verified) by media-motion.tv (CommuniGate Pro SMTP 4.2.10) with ESMTP id 5161611 for AE-List@media-motion.tv; Thu, 01 Aug 2013 07:09:39 +0200 Received: from mailpod.hostingplatform.com ([10.30.71.211]) by atl4mhob04.myregisteredsite.com (8.14.4/8.14.4) with ESMTP id r715L9S6010848 for ; Thu, 1 Aug 2013 01:21:09 -0400 Received: (qmail 32378 invoked by uid 0); 1 Aug 2013 05:21:09 -0000 X-TCPREMOTEIP: 75.51.169.132 X-Authenticated-UID: torno@sydefxink.com Received: from unknown (HELO ?10.0.1.7?) (torno@sydefxink.com@75.51.169.132) by 0 with ESMTPA; 1 Aug 2013 05:21:08 -0000 Subject: Re: [AE] ASC_SOP & ASC_SAT values References: From: David Torno Content-Type: text/plain; charset=us-ascii X-Mailer: iPhone Mail (10B329) In-Reply-To: Message-Id: <41A7702C-79CB-45FC-BB00-350AE7895BB1@sydefxink.com> Date: Wed, 31 Jul 2013 22:21:07 -0700 To: After Effects Mail List Content-Transfer-Encoding: quoted-printable Mime-Version: 1.0 (1.0) Thanks very much Bob for that thorough explanation. I love detailed oriented= people. They seem to be rare in this industry. :) > Or use Color Finesse within AE which can read ASC CDLs directly, so you'd j= ust need to invert the values in the .cdl file, then load it in. If they can get me actual .cdl files that would be great, but I'm not holdin= g my breath. Right now, the editor is exporting the CDL data as part of his E= DL and nothing more. The dailies had CDL metadata applied by a guy who is no= longer on the production and the producers opted to not pay $2500 for actua= l LUT files. Starting to question my career choices. :) > With all that said, is the CDL really your "viewing LUT" or is it represen= tation of the color correction that's been done, which is the normal use for= a CDL? So far from what little info I have managed to procure from the production, t= he DP designed 4-6 CDL's I think. Day and night exterior, day and night inte= rior. I may be wrong on that though. What I think is happening (total guess o= n this) is that the CDL's were applied to the dailies, which went to edit. C= olor got raw footage and had the LUT data but won't export without payment. S= o we in VFX land are getting 10bit DPX in raw color without the CDL info and= edit has no clue as to why it's all not WYSIWYG, but I can't say really. David Torno Visual Effects Artist & Supervisor http://www.ghosttownmedia.com O: 213.739.2290 C: 818.391.6060 --------------------- http://www.sydefxink.com http://aeioweyou.blogspot.com http://mactex.blogspot.com "The most useless day is that in which we do not laugh" -Charles Field On Jul 31, 2013, at 7:44 PM, "Bob Currier" wrote= : > "SOP" is "Slope, Offset, Power" in ASC CDL speak. We chose different names= because many people calculate lift/gamma/gain in different ways. >=20 > Slope is gain (multiplication). Offset is lift (addition). Power is gamma (= y^(1/x)). Saturation is saturation. >=20 > To reverse it, enter the reciprocal of slope as your "gain." Enter the rec= iprocal of power as "gamma." And enter the negative of offset as "lift." Ent= er saturation as the reciprocal of the CDL value. >=20 > The gain setting should work regardless of the color correction app. The g= amma value, however, may need to be entered as a reciprocal. The lift value i= s the hardest to deal with. Many apps adjust gain along with the lift settin= g, while the ASC CDL is a pure offset. >=20 > Or use Color Finesse within AE which can read ASC CDLs directly, so you'd j= ust need to invert the values in the .cdl file, then load it in. >=20 > With all that said, is the CDL really your "viewing LUT" or is it represen= tation of the color correction that's been done, which is the normal use for= a CDL? >=20 > -----=20 > Bob Currier rcurrier@synthetic-ap.com > Synthetic Aperture www.synthetic-ap.com > Helping Make Your Work Look Its Best >=20 > On Thu, Aug 1, 2013 6:41 PM, David Torno wrote: >=20 >> Curious question to anyone who has done a lot of CDL (Color Descision >> List) work. I'm use to using a generic Cineon Log to Lin for viewing and >> then doing a reverse process with Cineon Lin to Log for final output. >> Not once have I ever gotten a proper LUT on a project in the 13+ years >> I've been doing this work. Sad, very sad. Anyways, someone finally has >> some CDL values (not an actual LUT file mind you) and I can easily, >> manually, input the values into Colorista - Free, but how would I do a >> reverse of this properly? I'm assuming this CDL is essentially my >> "viewing" LUT and I would need it's opposite to reverse it all back with >> VFX applied. Did that make sense? Thanks for any insight. >>=20 >> What the editor exported for me, is an EDL that contained these lines as >> well as other clip data. >>=20 >> *ASC_SOP (1.0000 1.0000 1.0000)(0.0000 0.0000 0.0000)(1.0000 1.0000 1.000= 0)=20 >> *ASC_SAT 1=20 >>=20 >>=20 >> The ASC_SOP and ASC_SAT data exists, even though they are default >> neutral values. I'm hopeful that he will be able to get the actual CDL >> values that he is seeing in AVID. >>=20 >>=20 >> -- >> David Torno >> Visual Effects Artist and Supervisor >> http://www.ghosttownmedia.com >> david@ghosttownmedia.com >> O: 213.739.2290 >> C: 818.391.6060 >> ------------------------------------------------ >> http://www.sydefxink.com (main portfolio) >> http://aeioweyou.blogspot.com (vfx tutorials and AE scripts blog) >> http://mactex.blogspot.com (free textures blog) >>=20 >>=20 >>=20 >> +---End of message---+ >> To unsubscribe send any message to >=20 >=20 >=20 > +---End of message---+ > To unsubscribe send any message to >=20