I don't know much about colour spaces in QC and FCP but have a fair
bit of experience in colour space issues in print work and I'd be
looking at what conversions are being done — either explicitly or more
likely hidden. This looks like classic colour space conversion shift.
In Adobe apps 'No' for colour management settings options actually
perform conversions, they just don't bother you with the 'troublesome'
details, perhaps FCP is the same. For an image to shift that much in
colour values, I don't think bit depth could possibly be responsible,
not in still images — not sure about what FCP does when it down/up
samples pixel resolution.
Alastair I Leith
Useful Design
03 9480 5506
0432 889 831
30 Birch St
West Preston
VIC 3072 Au
On 22/12/2010, at 6:20 AM, Huer, Jonathan Blake wrote:
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.
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Jonathan Blake Huer
Director of Emerging Technologies
Ball State University
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765-717-5669 cell
jbh...@bsu.edu
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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
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