Compressor, circle type patterns on shirts? at DVinfo.net

Nick Stone · February 8th, 2009, 01:37 AM

Have a question regarding compressor frame settings and if compressor can fix my problem.
I recorded some interviews and some clients were wearing shirts that had stripes and check patterns. I have rendered out to a quick time file using same as seq settings. Seq settings and footage are from the Sony EX1 shot in 1920 x 1080p 25. I don’t know what the term is called but the rendered footage has made the shirts oscillate or put circle type patterns on them.
Can compressor with frame settings turned on, fix this and if so, how would I set this up.
All other footage is fine after rendering out in compressor.
Also the native EX1 footage does not have this oscillating occurrence.

Nick

Shaun Roemich · February 8th, 2009, 10:00 AM

The term for what you are seeing is moiré. This happens when fine line detail is too complex for an imager or medium to resolve, like the 70's weatherman with the herringbone sport coat.

Not sure if there's a way to suppress it. I'll let others chime in here.

Robert Lane · February 8th, 2009, 10:30 AM

It may be necessary to apply a graded soft-focus effect in FCP prior to export to the areas in the clip causing the moire (you'd need to selectively mask the problem areas). Then when it's rendered out there will be less detail to cause this problem; done properly this could eliminate the issue.

You could also apply a de-interlace filter built into Compressor (which may have limited effect in correcting the problem) but this would affect the entire clip you're encoding rather than just selective problem areas.

February 8th, 2009, 01:37 AM	#1
Nick Stone Regular Crew Join Date: May 2008 Location: Australia Posts: 133	Compressor, circle type patterns on shirts? Have a question regarding compressor frame settings and if compressor can fix my problem. I recorded some interviews and some clients were wearing shirts that had stripes and check patterns. I have rendered out to a quick time file using same as seq settings. Seq settings and footage are from the Sony EX1 shot in 1920 x 1080p 25. I don’t know what the term is called but the rendered footage has made the shirts oscillate or put circle type patterns on them. Can compressor with frame settings turned on, fix this and if so, how would I set this up. All other footage is fine after rendering out in compressor. Also the native EX1 footage does not have this oscillating occurrence. Nick

February 8th, 2009, 10:00 AM	#2
Shaun Roemich Inner Circle Join Date: Sep 2002 Location: Vancouver, British Columbia (formerly Winnipeg, Manitoba) Canada Posts: 4,088	The term for what you are seeing is moiré. This happens when fine line detail is too complex for an imager or medium to resolve, like the 70's weatherman with the herringbone sport coat. Not sure if there's a way to suppress it. I'll let others chime in here. __________________ Shaun C. Roemich Road Dog Media - Vancouver, BC - Videographer - Webcaster www.roaddogmedia.ca Blog: http://roaddogmedia.wordpress.com/

February 8th, 2009, 10:30 AM	#3
Robert Lane Go Go Godzilla Join Date: Nov 2004 Location: Scottsdale, AZ USA Posts: 2,823 Images: 15	It may be necessary to apply a graded soft-focus effect in FCP prior to export to the areas in the clip causing the moire (you'd need to selectively mask the problem areas). Then when it's rendered out there will be less detail to cause this problem; done properly this could eliminate the issue. You could also apply a de-interlace filter built into Compressor (which may have limited effect in correcting the problem) but this would affect the entire clip you're encoding rather than just selective problem areas.