Gamma Shift on Exported Clips during fade to black

Apple Final Cut Pro Legacy

Gamma Shift on Exported Clips during fade to black

Posted by Bob O’brien on March 2, 2011 at 10:04 pm

I have Uncompressed 8bit timeline with rendered footage. I have been asked to break program down into short sections with fade up and down to black for each segment.

The problem: on the fade to black, the picture seems to brighten before fading. This gamma shift is not noticable during playback from the timeline, only during playback of an exported clip.

Thoughts?

Thanks.

Bob

CAMERAS
Sony EX3, Sony DSR570 DVCAM, DXC637/PVV3 Betacam-SP

PORTABLE EDITING
*MacBook Pro – 2.33Ghz – 2Gb RAM
*Matrox MXO / 23″ Cinema Display

DESKTOP
*8-Core Mac Pro, 6 Gb RAM, 2 internal eSata drives, FW800 externals
*AJA IO
*Sony 2800

SOFTWARE
*OSX10.4.11, QT 7.5, FCP 6.0.4, Livetype 2.1.3, Soundtrack Pro 2.0.2, DVDSP4.2.1, Adobe CS3 Prod Suite

Rich Rubasch replied 15 years, 2 months ago 3 Members · 4 Replies
4 Replies

Bob O’brien
March 2, 2011 at 10:50 pm

Even if I start from scratch… import two clips from the original footage, place them in a new timeline, and do a cross dissolve between the them. With that is exported you can see a brightening of the out-going clip before the dissolve occurs.

By the way, this is betacam-sp footage which was digitized a few years ago on another fcp system.

I have trashed prefs, repaired permissions, and have even deleted all my render files – same problem.

CAMERAS
Sony EX3, Sony DSR570 DVCAM, DXC637/PVV3 Betacam-SP

PORTABLE EDITING
*MacBook Pro – 2.33Ghz – 2Gb RAM
*Matrox MXO / 23″ Cinema Display

DESKTOP
*8-Core Mac Pro, 6 Gb RAM, 2 internal eSata drives, FW800 externals
*AJA IO
*Sony 2800

SOFTWARE
*OSX10.4.11, QT 7.5, FCP 6.0.4, Livetype 2.1.3, Soundtrack Pro 2.0.2, DVDSP4.2.1, Adobe CS3 Prod Suite
John Kaley
March 3, 2011 at 12:22 am

Are you exporting using “Quicktime conversion” or just exporting with current settings? I’ve never had luck with QT conversion out of FCP; I always use current settings.
Bob O’brien
March 3, 2011 at 1:53 am

Thanks, John, for your reply.

You know what is ironic is that exporting with current settings ended up being the problem. After re-rendering and still finding the problem, I decided to try exporting using QT Conversion… Voila! Problem solved.

This was the first time I ever encountered this problem. Strange.

Thanks again.

Bob

CAMERAS
Sony EX3, Sony DSR570 DVCAM, DXC637/PVV3 Betacam-SP

PORTABLE EDITING
*MacBook Pro – 2.33Ghz – 2Gb RAM
*Matrox MXO / 23″ Cinema Display

DESKTOP
*8-Core Mac Pro, 6 Gb RAM, 2 internal eSata drives, FW800 externals
*AJA IO
*Sony 2800

SOFTWARE
*OSX10.4.11, QT 7.5, FCP 6.0.4, Livetype 2.1.3, Soundtrack Pro 2.0.2, DVDSP4.2.1, Adobe CS3 Prod Suite
Rich Rubasch
March 3, 2011 at 11:37 pm

When you export to QT with current settings check the box that says recompress all frames and see if that doesn’t fix the issue.

Rich Rubasch
Tilt Media Inc.
Video Production, Post, Studio Sound Stage
Founder/President/Editor/Designer/Animator
https://www.tiltmedia.com

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