EX1 can't handle teal and shades of black at DVinfo.net

Marius Boruch · August 25th, 2009, 08:22 PM

these groomsmen and child's suits were all black; and dressess were teal
see discussion here with pictures
http://www.dvinfo.net/conf/what-happ...ml#post1269844

Brooks Graham · August 25th, 2009, 09:26 PM

This is a known behavior with the EX1/EX3 cameras along with others (most notably the RED). It's called infrared contamination. Do a search in this forum and you'll see several detailed discussions.

On my first paying gig with my EX3, I shot a sit-down interview and the subject's very black suit got recorded as two very icky shades of brown.

The solution for me was the B+W / Schneider 486 UV-IR Cut filter 77mm Slim. (the 'Slim' is important)

Haven't seen the IR problem since (nor any vignetting that has been reported at the widest zoom).

Hope that helps. (but I know of no way of correcting the IR contaminated blacks in post, so I guess that doesn't help much with your current footage - others here may know better though)

-brooks

Olof Ekbergh · August 26th, 2009, 05:49 PM

I have not personally had this problem, I use mostly daylight lights. But have read a lot about this phenomenon.

I would say it is bound to happen, digital cameras like film are very different than our eyes.

I think this could easily be fixed in post, a secondary correction in Color.

Just use eye dropper to select by dragging across fabric and then fine tune in color sliders. Then adjust color in high, mid and dark etc. You could even turn the suit scarlet.

Bob Grant · August 27th, 2009, 05:45 AM

This cannot be easily fixed in post as the effect depends on the type of black fabric. To correct you need to mask and possibly track the offending fabrics and CC them.
I had this happen to me once, thankfully not on anything the client could complain about. Since then a 486 filter stays on the camera and the problem is gone.

Olof Ekbergh · August 27th, 2009, 06:22 AM

Quote:

Originally Posted by Bob Grant

This cannot be easily fixed in post as the effect depends on the type of black fabric. To correct you need to mask and possibly track the offending fabrics and CC them.

The post I made earlier is a really easy way to mask and track and correct any specific hue, using a secondary CC room in Apple's Color. It is very fast and easy to do. I use that technique often to make a specific change in one color.

You can do digital makeup on problematic skin very easily in the FX room, using similar tracking and masking. It is fast easy and works very well.

Dean Sensui · August 28th, 2009, 02:06 AM

Teal has always been a difficult color to capture, even on film.

Paul Kellett · August 28th, 2009, 02:54 AM

Does anyone know where i can get this filter in the uk ?

Cheers, Paul.

August 25th, 2009, 08:22 PM	#1
Marius Boruch Major Player Join Date: Aug 2005 Posts: 421	EX1 can't handle teal and shades of black these groomsmen and child's suits were all black; and dressess were teal see discussion here with pictures http://www.dvinfo.net/conf/what-happ...ml#post1269844 Last edited by Marius Boruch; August 25th, 2009 at 09:16 PM.

August 25th, 2009, 09:26 PM	#2
Brooks Graham Regular Crew Join Date: Nov 2008 Location: San Francisco, CA Posts: 121	This is a known behavior with the EX1/EX3 cameras along with others (most notably the RED). It's called infrared contamination. Do a search in this forum and you'll see several detailed discussions. On my first paying gig with my EX3, I shot a sit-down interview and the subject's very black suit got recorded as two very icky shades of brown. The solution for me was the B+W / Schneider 486 UV-IR Cut filter 77mm Slim. (the 'Slim' is important) Haven't seen the IR problem since (nor any vignetting that has been reported at the widest zoom). Hope that helps. (but I know of no way of correcting the IR contaminated blacks in post, so I guess that doesn't help much with your current footage - others here may know better though) -brooks Last edited by Brooks Graham; August 25th, 2009 at 09:33 PM. Reason: admitting to non-help

August 28th, 2009, 02:06 AM	#6
Dean Sensui Inner Circle Join Date: Oct 2001 Location: Honolulu, HI Posts: 2,054	Teal has always been a difficult color to capture, even on film. __________________ Dean Sensui Exec Producer, Hawaii Goes Fishing

August 28th, 2009, 02:54 AM	#7
Paul Kellett Trustee Join Date: Nov 2007 Location: Bristol UK Posts: 1,273	Does anyone know where i can get this filter in the uk ? Cheers, Paul. __________________ Round 2 GH5,FZ2000

August 26th, 2009, 05:49 PM	#3
Olof Ekbergh Sponsor: Westside AV Join Date: Dec 2008 Location: Mount Washington Valley, NH, USA Posts: 1,365	I have not personally had this problem, I use mostly daylight lights. But have read a lot about this phenomenon. I would say it is bound to happen, digital cameras like film are very different than our eyes. I think this could easily be fixed in post, a secondary correction in Color. Just use eye dropper to select by dragging across fabric and then fine tune in color sliders. Then adjust color in high, mid and dark etc. You could even turn the suit scarlet.

August 27th, 2009, 05:45 AM	#4
Bob Grant Trustee Join Date: Nov 2005 Location: Sydney Australia Posts: 1,570	This cannot be easily fixed in post as the effect depends on the type of black fabric. To correct you need to mask and possibly track the offending fabrics and CC them. I had this happen to me once, thankfully not on anything the client could complain about. Since then a 486 filter stays on the camera and the problem is gone.