Welcome to our community

Be a part of something great, join today!

Log in
  • Hey all, just changed over the backend after 15 years I figured time to give it a bit of an update, its probably gonna be a bit weird for most of you and i am sure there is a few bugs to work out but it should kinda work the same as before... hopefully :)

Still have Gamma Shift in SL and 4444

M

Matthew Riggieri

Well-known member
Joined
Oct 13, 2008
Messages
442
Reaction score
0
Points
16
Location
Baltimore, MD
Why.. Why oh why do I still see this issue. Project setup is as follows

Transcoded at full debayer to Prores4444
Conformed in Final Cut, Sent to Color
Graded in Color, using Panasonic 11 series plasma and JVC 23" over HD-SDI.
Sent back to Final Cut. The rendered ProRes444 Files lose contrast, obvisouly due to a gamma shift. What the HELL Apple, I thought that was fixed in the new OS and 4444.

So re-rendered everything in DPX clamping to Linear, everything is darker.

Now re-rendering everything to DPX but clamped to Video, hoping that gets me to see what i want to see.


All i want is when I look at a grade in Color and go back to Final Cut, they look the same on broadcast output.


Anyone? I am getting fed up.
 
Are you using Force RGB setting. I have had similar problems with that.
Michael
 
I was really hoping this would do it, but i am still having the same issue. It is a very slight shift, but noticable. The rendered PRORES files are just not the same thing i am looking at in color
 
Was your final render out of color and back to FCP also in 4:4:4 or did you subsample to a 4:2:2 codec? The subsampling could be responsible for a slight shift, I would think.
 
No everything was rendered back to 444. It is ever so slight, but it is definitely noticeable on my monitors. you would never tell the difference unless you alt-tab between color and FCP on the same frame
 
I have tried everything...

Changed the Ceiling and Floor IRE, turned off FORCE RGB, Turned off Broadcast Safe. Rendered to Uncompressed, rendered to 422, DPX, they all look wrong.

I am almost done with Apple, how can you deliver Quality Controled deliverables when you can't guarantee what you are looking at is the same as what you graded.
 
no using blackmagic.

Another problem is when you render a new 4444 file as a master, it shifts ever so slightly and when a render a h.264 to send to the client from that, it is way greener and less contrastier on my calibrated Dell monitor.

I am so frustrated at this point, because i just want to show the client something, and want them to see what i am looking at and what I graded to, but they can't. I know these are slight difference and won't really be able to tell the difference without looking at them directly but I want to be able to stand by my quality, and frankly it seems working with Final Cut, i can't
 
Alright, I used the FCP.mga lut provided with Color 1. They do not include it in the package for 1.5 I then had to adjust all the shots with the new LUT applied and render without it. This helped with the gamma shift. There is still a slight color shift towards green, but not as noticeable as the gamma shift.

I wonder why they took out all the LUTs our of the Color Package in 1.5.
 
Not sure if this is relevant, but just in case:

From Final Cut Pro 7.0.1: Release notes http://support.apple.com/kb/TS2521

"Fixes an issue where video material at 2048x1080 and 2048x1556 frame sizes would show a color shift."
 
Are you in a PAL country? If so: http://support.apple.com/kb/TS2861

"Rendering PAL material to ProRes 4444 in Color introduces a gamma shift in the resulting video file."
 
It is an old problem hitting us all in Color. My solution (but on old Color 1) is to render everything in DPX linear (force RGB on, broadcast safe on). Then I render DPXes to QT via Shake and ad gamma node and set it to 1.2. I do this when I do commercials, for longer sequences, like music videos I just render out ProRes, and export it from FCP via Compressor and ad gamma difference in Compressor. When you export via compressor you have filter tab in compressor and you cam select gamma and set it to 0.8 (vice versa of Shake). And I live in PAL country, so I don't know if it works for NTSC.

Pain in the ass! But Apple could finally solve this and make us al happier people!
 
The only way I've ever been able to avoid a gamma shift from one software to the other in the same system is by rendering in 'None'. A lot heavier then the Pro Res 4:4:4, but 'none' is still 4:4:4 and it seems to bypass some weird gamma burnin the quicktime format applies. Of course, if you ever want to output, you'll need to render to another codec, so the problem will likely return. Very frustrating.
 
You must log in or register to reply here.
Back
Top