LCD Sun Visor?

Boyd Ostroff · June 15th, 2006, 01:55 PM

I'll also cast my vote for 100 IRE (not percent :-)

Marcus Marchesseault · June 15th, 2006, 05:43 PM

Please correct me if I am wrong, but I seem to recall that DV goes up to 120 IRE, but it won't show much through a standard TV signal. I saw a chart that goes to 120IRE before and I can see more detail in the highlights on a computer monitor than a TV. This means that there is some detail in the highlights, but it won't show on the TV. You could use some color correction to change the gamma to bring some of that detail back down to broadcast levels. Regardless, don't have a great deal of zebra bars at 100IRE unless you are in a situation where you need to let background blow out so that faces can be preserved.

Giroud Francois · June 16th, 2006, 01:04 AM

DV erov 8 bit is digitized from 16 to 236, while 8 bit goes from 0 to 255, that is probably why some people are talking about superblack or superwhite value or consider that DV goes up to 120IRE.
Since most of codec are clipping to range 16-236, it is pretty dangerous to count on these extra values

Seth Bloombaum · June 16th, 2006, 08:45 AM

Zebras are a powerful tool, and indeed the only tool we usually have to determine exposure in the field.

I use all of them - 70-100%, but mostly 85 and 100. I use 85 for broad highlights on caucasian faces, and may let shiney face highlights go to 90-95. Sometimes 75 for broad highlights on people of color, depending. 100 is very handy as mentioned above for determining what will be blown out to white, usually it is only specular highlights that I'd want to see at 100% (point-like reflections off of shiney objects).

Racking through 70-100 is a great way to see whether a background is evenly lit, especially a chromakey background.

June 15th, 2006, 01:55 PM	#16
Boyd Ostroff Wrangler Join Date: Dec 2002 Location: Mays Landing, NJ Posts: 11,802	I'll also cast my vote for 100 IRE (not percent :-)

June 15th, 2006, 05:43 PM	#17
Marcus Marchesseault Trustee Join Date: Nov 2005 Location: Honolulu, HI Posts: 1,961	Please correct me if I am wrong, but I seem to recall that DV goes up to 120 IRE, but it won't show much through a standard TV signal. I saw a chart that goes to 120IRE before and I can see more detail in the highlights on a computer monitor than a TV. This means that there is some detail in the highlights, but it won't show on the TV. You could use some color correction to change the gamma to bring some of that detail back down to broadcast levels. Regardless, don't have a great deal of zebra bars at 100IRE unless you are in a situation where you need to let background blow out so that faces can be preserved.

June 16th, 2006, 01:04 AM	#18
Giroud Francois Inner Circle Join Date: Feb 2004 Location: switzerland Posts: 2,133	DV erov 8 bit is digitized from 16 to 236, while 8 bit goes from 0 to 255, that is probably why some people are talking about superblack or superwhite value or consider that DV goes up to 120IRE. Since most of codec are clipping to range 16-236, it is pretty dangerous to count on these extra values

June 16th, 2006, 08:45 AM	#19
Seth Bloombaum Inner Circle Join Date: Sep 2003 Location: Portland, Oregon Posts: 3,420	Zebras are a powerful tool, and indeed the only tool we usually have to determine exposure in the field. I use all of them - 70-100%, but mostly 85 and 100. I use 85 for broad highlights on caucasian faces, and may let shiney face highlights go to 90-95. Sometimes 75 for broad highlights on people of color, depending. 100 is very handy as mentioned above for determining what will be blown out to white, usually it is only specular highlights that I'd want to see at 100% (point-like reflections off of shiney objects). Racking through 70-100 is a great way to see whether a background is evenly lit, especially a chromakey background.