I'm not much of an expert on Quartz, but I'm a Master Trainer in Final Cut Studio. There's a lot that FCP and Motion do under the hood with color bit depth. My guess is your noticeable shift could be happening there. If you want to send me more information off list, I'm happy to go into more detail as to what Final Cut/Motion are doing and do my best to help you out.
-- Jonathan Blake Huer Director of Emerging Technologies Ball State University 765-285-3001 office 765-717-5669 cell jbh...@bsu.edu *Please consider the environment before printing my email* From: Patrick Sheffield <psheffi...@earthlink.net<mailto:psheffi...@earthlink.net>> Date: Tue, 21 Dec 2010 14:04:41 -0500 To: erDevelopment <developm...@erreklam.hu<mailto:developm...@erreklam.hu>> Cc: quartzcomposer-dev list list <quartzcomposer-dev@lists.apple.com<mailto:quartzcomposer-dev@lists.apple.com>> Subject: Re: Why is there a difference... I don't think so - I know about FCP's gamma shift - this is definitely a color difference. Also when called from within FCP/Motion (as a plugin), it does the same thing. thanks, Patrick On Dec 21, 2010, at 10:50 AM, erDevelopment wrote: Hi Patrick, Maybe it is the FCP/Quicktime gamma shifting problem. Try to google around on "FCP gamma shift". Robert On 2010.12.21., at 19:32, Patrick Sheffield wrote: The original image came from a BetaSP tape, but it doesn't matter - I see the same difference in all material. I didn't include a composition as all I'm doing is taking an input image and the Screen blend node and running it into both inputs, then the result to a billboard. If I do the same thing in FCP/Motion (place an image on V1/V2 with V2 set to Screen composite mode), the result is considerably different. I don't think Quartz is doing it wrong, I just need to figure out what FCP/Motion are actually doing... regards, Patrick On Dec 21, 2010, at 10:16 AM, George Toledo wrote: No composition? This makes it hard to discern. Try using Billboard, and adjusting native core image in settings, to see if that makes a difference. Where are these images coming from? They both have edge crud... is this from the screengrab? It looks like a gamma difference (but maybe not). Is that happening because the FCP image is coming from something that is already run through a codec? -GT On Tue, Dec 21, 2010 at 1:08 PM, Patrick Sheffield <psheffi...@earthlink.net<mailto:psheffi...@earthlink.net>> wrote: ...between how Quartz Composer processes the Screen blend mode and how Final Cut Pro and Motion do it? This is an image screened over itself in Final Cut Pro/Motion: And in Quartz Composer: In Quartz Composer it's flatter and considerably more red than FCP. If I perform a Screen Blend (the inverse of the multiplication of the inverse), I get the same result as Quartz, but I need to figure out what FCP/Motion are doing differently. Does anyone have any insight? Thanks, Patrick Sheffield Sheffield Softworks _______________________________________________ Do not post admin requests to the list. They will be ignored. Quartzcomposer-dev mailing list (Quartzcomposer-dev@lists.apple.com<mailto:Quartzcomposer-dev@lists.apple.com>) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/quartzcomposer-dev/gtoledo3%40gmail.com This email sent to gtole...@gmail.com<mailto:gtole...@gmail.com> -- George Toledo gtole...@gmail.com<mailto:gtole...@gmail.com> www.georgetoledo.com<http://www.georgetoledo.com/> The information contained in this E-mail and any attachments may be confidential. If you have received this E-mail in error, please notify us immediately by telephone or return E-mail. You should not use or disclose the contents of this E-mail or any of the attachments for any purpose or to any persons. _______________________________________________ Do not post admin requests to the list. They will be ignored. Quartzcomposer-dev mailing list (Quartzcomposer-dev@lists.apple.com<mailto:Quartzcomposer-dev@lists.apple.com>) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/quartzcomposer-dev/development%40erreklam.hu This email sent to developm...@erreklam.hu<mailto:developm...@erreklam.hu> _______________________________________________ Do not post admin requests to the list. They will be ignored. Quartzcomposer-dev mailing list (Quartzcomposer-dev@lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/quartzcomposer-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
