Underexposure, rescuing information in post at DVinfo.net

Eduardo Mayen · January 12th, 2007, 07:32 PM

it's always safer too underexpose and save your highlights from oblivion, but how much underexposure is safe if i want to rescue that information with a power window later? Anyone had any experience with this situation.

A. J. deLange · January 16th, 2007, 10:30 AM

I don't think a specific answer to the question is possible. It depends very much on the subject matter and personal preference. The problem with trying to fish detail out of the shadows in 8 bit wide data is that there just aren't enough levels. The histogram breaks into a "picket fence" and the image becomes "posterized". The amount of this which is tolerable depends on the individual. Experiment!

Cole McDonald · January 16th, 2007, 12:45 PM

not much...I always underexpose, but usually I use zebras at 90 and turn them til they just disappear from my subject. Maybe a little more down if I can save some highlights by doing so as well. Thumb wheel on the XL1s clicks, I don't go more than 2 clicks under where the zebras disappear. Footage I intend to project/TV I tend to run slightly darker than stuff I intend to be seen on computer.

January 12th, 2007, 07:32 PM	#1
Eduardo Mayen Regular Crew Join Date: Feb 2002 Location: LAs Vegas Posts: 32	Underexposure, rescuing information in post it's always safer too underexpose and save your highlights from oblivion, but how much underexposure is safe if i want to rescue that information with a power window later? Anyone had any experience with this situation. __________________ Eduardo

January 16th, 2007, 12:45 PM	#3
Cole McDonald Trustee Join Date: Nov 2005 Location: Sauk Rapids, MN, USA Posts: 1,675	not much...I always underexpose, but usually I use zebras at 90 and turn them til they just disappear from my subject. Maybe a little more down if I can save some highlights by doing so as well. Thumb wheel on the XL1s clicks, I don't go more than 2 clicks under where the zebras disappear. Footage I intend to project/TV I tend to run slightly darker than stuff I intend to be seen on computer. __________________ Web Youtube Facebook

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search

January 16th, 2007, 10:30 AM	#2
A. J. deLange Major Player Join Date: Jun 2004 Location: McLean, VA United States Posts: 749	I don't think a specific answer to the question is possible. It depends very much on the subject matter and personal preference. The problem with trying to fish detail out of the shadows in 8 bit wide data is that there just aren't enough levels. The histogram breaks into a "picket fence" and the image becomes "posterized". The amount of this which is tolerable depends on the individual. Experiment!