X3F raw Bit Depth

Started 5 months ago | Discussions thread
ForumParentFirstPrevious
Flat view
xpatUSA
xpatUSA Forum Pro • Posts: 12,414
X3F raw Bit Depth

As a long-term user of RawDigger, I often check the raw histogram for ETTR.

Often, an image has a capture that does not match the bit depth of the ADC in any way shape or form - and can have a sensor saturation value well in excess of, or indeed well less than, the bit depth of the ADC (Quattro: 14-bit =16,383 Pre-Q: 12-bit = 4095).

The two exceptions to those comments are the Merrills and the dp0 Quattro (the only example raw I've got).

List for heavily-exposed, fully-saturated captures:

12-bit ADCs:

SD10: over 20,000

SD14: up at around 10,000

High levels for the above are often single outliers, with quite a gap down to the next lower level.

SD15, DP2s: down at around 2,350 !!

Merrills: about 4080 (pretty close to 4095)

OTOH high levels for those two have a quite a lot of counts when over-exposed.

14-bit ADCs:

dp0 Quattro: exactly 16,383 It indicates ADC saturation rather than sensor saturation.

A good few outliers in the Q image, but particularly a 5K spike "brick-walled" at a level of 16,383.

Reiner or Roland could perhaps explain the occurrence of these in-camera inconsistencies before the X3F gets written to the card in the camera.

-- hide signature --

Sigma - Consistency 'R' Us ...
Ted

 xpatUSA's gear list:xpatUSA's gear list
Sigma DP1 Merrill Panasonic Lumix DMC-G1 Sigma SD14 Sigma SD15 Panasonic Lumix DMC-GH1 +14 more
Sigma dp0 Quattro Sigma DP2s Sigma SD10 Sigma SD14 Sigma SD15
If you believe there are incorrect tags, please send us this post using our feedback form.
ForumParentFirstPrevious
Flat view
Post (hide subjects) Posted by
ForumParentFirstPrevious
Keyboard shortcuts:
FForum PPrevious NNext WNext unread UUpvote SSubscribe RReply QQuote BBookmark MMy threads
Color scheme? Blue / Yellow