Auto Levels/color is strobe :-( at DVinfo.net

Rafael Lopes · April 19th, 2006, 12:19 AM

I was making some CC tests and after I exported a video using "auto levels", "auto color" and "auto contrast" the footage got a weird flickering/strobe effect that makes the whole video unusable. I tried the same thing on Premiere and After Effects. Does anyone know why might this be happening?

Doug Boze · April 19th, 2006, 03:14 PM

This appears to be a common bug in PPro. I don't know of any fix for it.

Lloyd Coleman · April 26th, 2006, 11:06 AM

I think this is what is happening. Premiere analyzes each frame and then corrects it. If the material changes much from frame to frame it makes a different adjustment to each frame, which appears as the strobing that you are seeing. If you put a value in the 'Temporal Smothing' area of the Auto Color, Contrast or Levels corrector it will look at adjacent frames (depending on the number you put in the box) and apply an average correction, not based on just on a single frame, but on adjacent frames as well. This should make the correction smoother and prevent the strobing you are seeing.

Kevin Janisch · April 26th, 2006, 12:05 PM

Lloyd,

Yes, you are 100% correct, I ran into this very same issue weeks ago. I don't see why Adobe doesn't have a more usable default setting.

Kevin

Doug Boze · April 27th, 2006, 05:11 PM

I would like to mention that the Matrox RT.X100 card does color correction on the fly with easier control. It's one of the card's strongest benefits.

April 19th, 2006, 12:19 AM	#1
Rafael Lopes Trustee Join Date: Sep 2005 Location: Rio de Janeiro Posts: 1,239	Auto Levels/color is strobe :-( I was making some CC tests and after I exported a video using "auto levels", "auto color" and "auto contrast" the footage got a weird flickering/strobe effect that makes the whole video unusable. I tried the same thing on Premiere and After Effects. Does anyone know why might this be happening?

April 19th, 2006, 03:14 PM	#2
Doug Boze Major Player Join Date: Jun 2005 Location: Auburn, Washington Posts: 218	This appears to be a common bug in PPro. I don't know of any fix for it. __________________ "They that can give up essential liberty to obtain a little temporary safety deserve neither liberty nor safety." -- Benjamin Franklin, 1759

April 27th, 2006, 05:11 PM	#5
Doug Boze Major Player Join Date: Jun 2005 Location: Auburn, Washington Posts: 218	I would like to mention that the Matrox RT.X100 card does color correction on the fly with easier control. It's one of the card's strongest benefits. __________________ "They that can give up essential liberty to obtain a little temporary safety deserve neither liberty nor safety." -- Benjamin Franklin, 1759

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April 26th, 2006, 11:06 AM	#3
Lloyd Coleman Major Player Join Date: Oct 2003 Location: Salt Lake City, UT Posts: 256	I think this is what is happening. Premiere analyzes each frame and then corrects it. If the material changes much from frame to frame it makes a different adjustment to each frame, which appears as the strobing that you are seeing. If you put a value in the 'Temporal Smothing' area of the Auto Color, Contrast or Levels corrector it will look at adjacent frames (depending on the number you put in the box) and apply an average correction, not based on just on a single frame, but on adjacent frames as well. This should make the correction smoother and prevent the strobing you are seeing.

April 26th, 2006, 12:05 PM	#4
Kevin Janisch Major Player Join Date: Jan 2004 Location: Monterey, CA Posts: 406	Lloyd, Yes, you are 100% correct, I ran into this very same issue weeks ago. I don't see why Adobe doesn't have a more usable default setting. Kevin