FCP to AE to FCP ;-)

[Bill Nelson]

Jeremy – sorry for my bad english. Maybe it’s confusing you. So again:

When I import my Footage to AE and compare the clip to the same footage in FCP, I SEE a gamma shift on my waveform monitor. Means – my clip in FCP is darker than the clip in AE. The funny thing is; when I render my clip in AE and import it into FCP – the gamma is correct.

But when I turn ON the legacy-option the preview in AE works also correct. Means – I can’t see a difference in gamma on my waveform comparing FCP and AE.

Do you get me?

I just would like to know why I still have to check the legacy-option to put out a correct signal over the AJA card.

[Jeremy Garchow]

[Bill Nelson] “Do you get me? “

So no matter what, your renders are now coming out gamma shift free, but in oder to get the proper preview out of AE, you need to enable the use legacy gamma?

Try capturing a new clip as a test with this current setup and see if that’s still true.

In cs4, for me, it makes no difference if I check the use legacy or not, there’s no shift.

If you can, would you care to upload a few frames of your video so we can see the same thing?

Jeremy

[Bill Nelson]

So no matter what, your renders are now coming out gamma shift free, but in oder to get the proper preview out of AE, you need to enable the use legacy gamma?

Correct!

Try capturing a new clip as a test with this current setup and see if that’s still true.

Yes. 🙁

If you can, would you care to upload a few frames of your video so we can see the same thing?

https://www.megaupload.com/?d=3BCIQJ4H

Although I think that you won’t see a problem with this file, because it seems to be more a problem with my AE or Quicktime. I don’t know! 🙁

[Jeremy Garchow]

I see what you’re seeing. Maybe it has to do with PAL vs NTSC or more likely HD vs SD. All my tests have been with HD material and there’s no reason for the gamma shift selection. Do you have any HD to try this out with? I’d be curious to see. Also, I’d test a ProRes capture vs a 10bit PAL capture. It might be codec and resolution dependent.

Jeremy

[Matt Larson]

[Bill Nelson] “So no matter what, your renders are now coming out gamma shift free, but in oder to get the proper preview out of AE, you need to enable the use legacy gamma?”

In the AJA control panel tab “codec” look at the YUV>RGB Conversion Gamma tab. Is it set to auto? I might have this wrong, but I think the Kona will set gamma dependent on frame size, but AE doesn’t necessarily do that. So, AE may be sending 601 to the Kona, but the Kona sees the frame size and sets it to 709. Anyway, try switching that out of Auto and see if that helps.

2 x3Ghz Quad MacPro
9 GB RAM
Mac OS X 10.5.5
QT 7.5.5
FCP 6.0.5
AJA Kona 3 (6.0.1 drivers)
G-Speed XL 12 RAID

[Bill Nelson]

Hooray! Found the solution! Thank you!!!

To test my problem I created a normal DV-PAL Composition and added a 50% grey solid. My waveform displayed me a solid line at about 60% – the gamma shift.

Then I changed to the AJA Control Panel and left ColorSpace untouched set to “Auto”. I changed Gamma to Linear (1.8) and bang! – my line just sits perfectly on 50%.

Now I only have to learn about Gamma stuff again, because I don’t understand in detail why I have to select 1.8. I always thought of video with a gamma of 2,2.

Thank you guys!