X3F raw Bit Depth

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xpatUSA Forum Pro • Posts: 13,682
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.

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Sigma - Consistency 'R' Us ...

 xpatUSA's gear list:xpatUSA's gear list
Sigma DP2 Sigma DP1 Merrill Panasonic Lumix DMC-G1 Sigma SD14 Sigma SD15 +16 more
Sigma dp0 Quattro Sigma DP2s Sigma SD10 Sigma SD14 Sigma SD15
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