short gamma-comparison

Dominik Seibold · June 10th, 2008, 07:39 AM

I made some shots for comparing various gamma-curves:
http://www.dominik.ws/ex1-gammas.mov
all with detail-off, matrix-off, black/black-gamma/gamma-level 0.

Bill Ravens · June 10th, 2008, 08:30 AM

If you'd like to see the effect on the actual gamma curve, connect the output to a WFM, turn on the maintenance menu and select SAW.

It's rather humorous to see people adopt CINE modes because that's what everyone else does. Here's a pretty good example of how whites get blown out and the whole image gets compressed into a rather flat looking image by using a CINE mode. Blacks have a minimum value of about 10-20% IRE and whites are around 95%.

Craig Seeman · June 10th, 2008, 10:48 AM

I wonder why STD 4 Auto Knee caused the dog to run away.

Christopher Barry · June 11th, 2008, 10:04 AM

Dominik,

Did you adjust aperture between each shot of the various Cine and STD gamma curves? Thank you.

Dominik Seibold · June 11th, 2008, 11:18 AM

No, nothing changed but the gamma-curves. Difference in brightness is caused only by the gamma-curves.

Tom Roper · June 11th, 2008, 01:14 PM

Interesting to see the difference in real world situations. Thanks for posting Dominik.

I have been shooting tests in high contrast situations, backlit, direct sun behind the subject, trees, leaves, foliage, reflections on water.

Std 3 auto knee was completely overwhelmed by blown highlights, but the manual knee was very good, providing all the necessary control. Turning on Zebra2 (100%) in conjunction with the histogram and (just looking at the scene in the LCD) was confidence inspiring with the two points plus slope of the manual knee adjustment. Easy to do on a tripod, but would be a real fuss handheld. With Cine1, it would be hassle-free but flatter looking image.

Dogs have issues with Std 4.

June 10th, 2008, 07:39 AM	#1
Dominik Seibold Regular Crew Join Date: May 2008 Location: Germany Posts: 137	short gamma-comparison I made some shots for comparing various gamma-curves: http://www.dominik.ws/ex1-gammas.mov all with detail-off, matrix-off, black/black-gamma/gamma-level 0.

June 10th, 2008, 08:30 AM	#2
Bill Ravens Inner Circle Join Date: Nov 2001 Location: santa fe, nm Posts: 2,758 Images: 10	If you'd like to see the effect on the actual gamma curve, connect the output to a WFM, turn on the maintenance menu and select SAW. It's rather humorous to see people adopt CINE modes because that's what everyone else does. Here's a pretty good example of how whites get blown out and the whole image gets compressed into a rather flat looking image by using a CINE mode. Blacks have a minimum value of about 10-20% IRE and whites are around 95%. __________________ ~~~~~~~~~~~~~~~~~~~CHALCHIHUITL (fix it in post) PRODUCTIONS~~~~~~~~~~~ XDCAM EX--JVC HD110-----PC Based Avid Media Composer/Edius Broadcast/Vegas Pro--CINEFORM Last edited by Bill Ravens; June 10th, 2008 at 03:38 PM.

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June 10th, 2008, 10:48 AM	#3
Craig Seeman Trustee Join Date: Feb 2004 Location: Brooklyn, NY, USA Posts: 1,734	I wonder why STD 4 Auto Knee caused the dog to run away.

June 11th, 2008, 10:04 AM	#4
Christopher Barry Regular Crew Join Date: Jan 2007 Location: Australia Posts: 101	Dominik, Did you adjust aperture between each shot of the various Cine and STD gamma curves? Thank you.

June 11th, 2008, 11:18 AM	#5
Dominik Seibold Regular Crew Join Date: May 2008 Location: Germany Posts: 137	No, nothing changed but the gamma-curves. Difference in brightness is caused only by the gamma-curves.

June 11th, 2008, 01:14 PM	#6
Tom Roper Trustee Join Date: Jun 2004 Location: Denver, Colorado Posts: 1,021	Interesting to see the difference in real world situations. Thanks for posting Dominik. I have been shooting tests in high contrast situations, backlit, direct sun behind the subject, trees, leaves, foliage, reflections on water. Std 3 auto knee was completely overwhelmed by blown highlights, but the manual knee was very good, providing all the necessary control. Turning on Zebra2 (100%) in conjunction with the histogram and (just looking at the scene in the LCD) was confidence inspiring with the two points plus slope of the manual knee adjustment. Easy to do on a tripod, but would be a real fuss handheld. With Cine1, it would be hassle-free but flatter looking image. Dogs have issues with Std 4.