Color shift between scrubbing and overlay play-back? at DVinfo.net

Graham Hickling · December 31st, 2005, 12:40 AM

I've just started using Aspect 3.4 to edit some Sony HC1 footage, using a computer with an NVidia dual-head GFX5200 card driving two CRT monitors.

Everything scrubs and plays smoothly, however when I "play" the CFHD avi footage (i.e. using the overlay) the footage is noticablely darker and color-shifted relative to the image I see when I scrub or pause the timeline. Which is obviously a pain when it comes to color-balancing, etc.

The thing is ... I don't get any such shift when I'm editing with regular DV-codec footage.

Any suggestions as to how I might get my CHFD footage playback and scrubbing views to match more closely? Thanks.

David Newman · December 31st, 2005, 12:59 AM

This is in the readme; the many of the NVidia card aren't calibrated for YUV overlay correctly. The readme will explain the adjustment needed (see the CineForm/AspectHD under Programs.)

Graham Hickling · December 31st, 2005, 01:58 PM

Doh! Yes, the 'readme' instructions fixed things immediately.

Thanks for the fast reply, despite my lame question.

Marc Colemont · January 1st, 2006, 11:23 AM

I was about asking the same question. And indeed I have an nVidia too.
Solved and closed.

Spike Spiegel · July 18th, 2006, 06:55 PM

David, I have the 7600gt and i am having the same color shifting problem...I was told to follow the readme instructions and i have followed them, but the shifting of color still remains... i'm using the graphics drivers 91.31 drivers (forceware) if that helps.. Please let me know what i'm doing wrong...

David Newman · July 19th, 2006, 08:45 AM

It is unfortunate that NVidia doesn't calibrate their YUV output, and it seems that some cards are worse than others. Most however can be adjusted pretty close, you just need to make sure the overlay is what you are adjusting. The overlay on gaming NVidia card has its saturation default at 114% (why???) and is too dark (often with a gamma shift.) No one at NVidia has ever explained why this is. ATI, Matrox, others don't do this.

Spike Spiegel · July 19th, 2006, 09:50 AM

thanks for the response David. I am fine with upgrading my 7600gt, can you please recommend a card with horsepower that can do compositing, yet has features (breakout box maybe) that 'll keep it futureproof for a while? Budget doesn't concern me, so please name a few cards that'll work great for me.. Thanks

December 31st, 2005, 12:40 AM	#1
Graham Hickling Trustee Join Date: May 2004 Location: Knoxville, Tennessee Posts: 1,669	Color shift between scrubbing and overlay play-back? I've just started using Aspect 3.4 to edit some Sony HC1 footage, using a computer with an NVidia dual-head GFX5200 card driving two CRT monitors. Everything scrubs and plays smoothly, however when I "play" the CFHD avi footage (i.e. using the overlay) the footage is noticablely darker and color-shifted relative to the image I see when I scrub or pause the timeline. Which is obviously a pain when it comes to color-balancing, etc. The thing is ... I don't get any such shift when I'm editing with regular DV-codec footage. Any suggestions as to how I might get my CHFD footage playback and scrubbing views to match more closely? Thanks.

December 31st, 2005, 12:59 AM	#2
David Newman CTO, CineForm Inc. Join Date: Jul 2003 Location: Cardiff-by-the-Sea, California Posts: 8,095	This is in the readme; the many of the NVidia card aren't calibrated for YUV overlay correctly. The readme will explain the adjustment needed (see the CineForm/AspectHD under Programs.) __________________ David Newman -- web: www.gopro.com blog: cineform.blogspot.com -- twitter: twitter.com/David_Newman

July 19th, 2006, 08:45 AM	#6
David Newman CTO, CineForm Inc. Join Date: Jul 2003 Location: Cardiff-by-the-Sea, California Posts: 8,095	It is unfortunate that NVidia doesn't calibrate their YUV output, and it seems that some cards are worse than others. Most however can be adjusted pretty close, you just need to make sure the overlay is what you are adjusting. The overlay on gaming NVidia card has its saturation default at 114% (why???) and is too dark (often with a gamma shift.) No one at NVidia has ever explained why this is. ATI, Matrox, others don't do this. __________________ David Newman -- web: www.gopro.com blog: cineform.blogspot.com -- twitter: twitter.com/David_Newman

December 31st, 2005, 01:58 PM	#3
Graham Hickling Trustee Join Date: May 2004 Location: Knoxville, Tennessee Posts: 1,669	Doh! Yes, the 'readme' instructions fixed things immediately. Thanks for the fast reply, despite my lame question.

January 1st, 2006, 11:23 AM	#4
Marc Colemont Major Player Join Date: Nov 2005 Location: Belgium Posts: 695	I was about asking the same question. And indeed I have an nVidia too. Solved and closed.

July 18th, 2006, 06:55 PM	#5
Spike Spiegel Major Player Join Date: Feb 2005 Location: Los Angeles, CA Posts: 429	David, I have the 7600gt and i am having the same color shifting problem...I was told to follow the readme instructions and i have followed them, but the shifting of color still remains... i'm using the graphics drivers 91.31 drivers (forceware) if that helps.. Please let me know what i'm doing wrong...

July 19th, 2006, 09:50 AM	#7
Spike Spiegel Major Player Join Date: Feb 2005 Location: Los Angeles, CA Posts: 429	thanks for the response David. I am fine with upgrading my 7600gt, can you please recommend a card with horsepower that can do compositing, yet has features (breakout box maybe) that 'll keep it futureproof for a while? Budget doesn't concern me, so please name a few cards that'll work great for me.. Thanks