Testing my GH2's sensor

Started Feb 20, 2011 | Discussions thread
Shop cameras & lenses ▾
bg2b OP
Contributing MemberPosts: 897Gear list
Re: Testing my GH2's sensor
In reply to Kolen, Feb 22, 2011

Look at a RAW-level histogram at the low levels of an exposure. Stick to the low levels because the compression used in RW2 files may not accurately record the low-order bits at high signal levels.

Example from the green channel for part of a scene shot at ISO 160, 200, 250, and 320 with fixed aperture and shutter speeds 1/400, 1/500, 1/640, 1/800. The graphs have the RAW level on the x-axis and the number of pixels with each RAW level on the y-axis. A real ISO will have a filled-in histogram, while an artificial one that's been digitally pushed tends to show peaks and gaps.

Reply   Reply with quote   Complain
Post (hide subjects)Posted by
(unknown member)
(unknown member)
(unknown member)
Keyboard shortcuts:
FForum PPrevious NNext WNext unread UUpvote SSubscribe RReply QQuote BBookmark post MMy threads
Color scheme? Blue / Yellow