photo movement strobing in FCE at DVinfo.net

Chuck Peterson · September 12th, 2007, 06:04 PM

I'm working on a short project that involves only B&W still portraits dissolving into each other. It was my first project using motion keyframes on the canvas and I was amazed at how easy it was to make some nice slow panning zooms into the photos.

I started with large TIFFs given to me on CD by a commercial photographer. I simply imported the TIFFs, dragged them to the timeline and created my moves.

Everything seemed just great except that after adding motion, dissolves and rendering, I started to notice in the hair, eyebrows, glasses frames and fine details that I could see some sort of strobing artifact. It looked like a horizontal, interlacing issue so I tried applying the video de-interlace filter. This did not help much. Then I tried the video flicker filter which made it quite a bit better but if you look closely, you still see the artifact, even after the sequence was printed to video.

The image looks so great as a still. Why does motion add these defects and what can be done?

Nate Schmidt · September 13th, 2007, 08:52 PM

One thing I would suggest checking is to make sure all your images are RGB and not CMYK. If you have Photoshop you can do all the conversions there. Also you could try changing your render settings to render in RGB, but only do this if all your material is stills.

Les Wilson · September 13th, 2007, 09:10 PM

This is a common problem with stills. It's rooted in the scaling required to shrink the photo to video frame size. If you can, try pre-shrinking the photo using a photo editing program such as Fireworks or Photoshop before bringing them into FCE. Just make sure you have enough of the image outside the video frame to perform the motion you desire. Something that may help for a pesky one is to apply a slight blur to the image before importing it into FCE. As a last resort, try rotating the photo slightly one way or the other.

Scott Shama · September 15th, 2007, 05:07 AM

Do it in Motion and drop the motion file into FCP. Motions been an awesome tool for that kind of stuff.

Cheers,
Scott

Chuck Peterson · September 15th, 2007, 10:11 AM

I'll see what works.

Chuck

Daniel Ross · September 15th, 2007, 11:00 AM

Deinterlacing the clip after applying that isn't the best way to go.
Instead, make your project deinterlaced to begin with, in the settings.

One trick I noticed--
I had a series of several images fading into each other. Once an image reached 100% opacity, it changed, and was more crisp. This caused a slight jump in the video.
To compensate, I just made the images only fade up to 99% opacity. You can't tell looking at them, and the slight jump is gone.
Not sure if this applies in your case.

September 12th, 2007, 06:04 PM	#1
Chuck Peterson New Boot Join Date: Mar 2007 Location: Grand Rapids, MI Posts: 10	photo movement strobing in FCE I'm working on a short project that involves only B&W still portraits dissolving into each other. It was my first project using motion keyframes on the canvas and I was amazed at how easy it was to make some nice slow panning zooms into the photos. I started with large TIFFs given to me on CD by a commercial photographer. I simply imported the TIFFs, dragged them to the timeline and created my moves. Everything seemed just great except that after adding motion, dissolves and rendering, I started to notice in the hair, eyebrows, glasses frames and fine details that I could see some sort of strobing artifact. It looked like a horizontal, interlacing issue so I tried applying the video de-interlace filter. This did not help much. Then I tried the video flicker filter which made it quite a bit better but if you look closely, you still see the artifact, even after the sequence was printed to video. The image looks so great as a still. Why does motion add these defects and what can be done?

September 13th, 2007, 08:52 PM	#2
Nate Schmidt Major Player Join Date: Jul 2005 Location: Welland ON Posts: 515	One thing I would suggest checking is to make sure all your images are RGB and not CMYK. If you have Photoshop you can do all the conversions there. Also you could try changing your render settings to render in RGB, but only do this if all your material is stills. __________________ "We've done the impossible, and that makes us mighty."

September 15th, 2007, 10:11 AM	#5
Chuck Peterson New Boot Join Date: Mar 2007 Location: Grand Rapids, MI Posts: 10	Thanks all for the excellent suggestions I'll see what works. Chuck

September 13th, 2007, 09:10 PM	#3
Les Wilson Inner Circle Join Date: Jan 2004 Location: Boca Raton, FL Posts: 3,014	This is a common problem with stills. It's rooted in the scaling required to shrink the photo to video frame size. If you can, try pre-shrinking the photo using a photo editing program such as Fireworks or Photoshop before bringing them into FCE. Just make sure you have enough of the image outside the video frame to perform the motion you desire. Something that may help for a pesky one is to apply a slight blur to the image before importing it into FCE. As a last resort, try rotating the photo slightly one way or the other.

September 15th, 2007, 05:07 AM	#4
Scott Shama Major Player Join Date: Jan 2005 Location: Beaverton, Oregon Posts: 399	Do it in Motion and drop the motion file into FCP. Motions been an awesome tool for that kind of stuff. Cheers, Scott

September 15th, 2007, 11:00 AM	#6
Daniel Ross Major Player Join Date: Jul 2007 Location: Marin & Davis, CA, USA Posts: 418	Deinterlacing the clip after applying that isn't the best way to go. Instead, make your project deinterlaced to begin with, in the settings. One trick I noticed-- I had a series of several images fading into each other. Once an image reached 100% opacity, it changed, and was more crisp. This caused a slight jump in the video. To compensate, I just made the images only fade up to 99% opacity. You can't tell looking at them, and the slight jump is gone. Not sure if this applies in your case.