Linear RAW Curve and bit depth reporting

Submitted by PhotoMan on

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Help me understand Linear Raw curve option

e.g. when Nikon D5500 it reports only 4096 levels max when linear raw curve is on, when off it reports 16384 levels which one is correct?

https://www.upload.ee/files/17759355/Nikon_D5500.zip.html

Not very clear.
Linear Raw Curve: to use the linear tone curve instead of the nonlinear (compression) one. This
parameter is important only for cameras and data formats that use the tone curve specified in EXIF
data for raw data linearization (e.g., a significant number of Sony cameras).

There is no 'bit depth

Submitted by lexa on

There is no 'bit depth reporting' in RawDigger. Even if (embedded) Exiftool reports it: we cannot help you with the interpretation of this parameter.

Nikon lossy compressed images uses highlight compression (lossy) on RAW recording, expansion on decompressing (similar but not exact to Sony cRAW curve, please refer to this article: https://www.rawdigger.com/howtouse/sony-craw-arw2-posterization-detection see 'Inside Sony cRAW format' section).

How there is no bit depth

Submitted by PhotoMan on

How there is no bit depth reported if you show max levels per channel this not enough for indication of bit depth?

Yes, we display max data

Submitted by lexa on

Yes, we display max data level  (of uncompressed data processed via tone curve if specified for format).

We never use 'bit depth' term.

We describe Sony lossy/cRAW/ARW format in depth in our article: https://www.rawdigger.com/howtouse/sony-craw-arw2-posterization-detection



Could you please count 'bit depth' of this format? Is it 7 bits (delta bit count)? Or 11 bits (base value for each compressed block)? Or 14+ (15?) bits (based on linearized data range, slightly above of 16384)?

Also what can you say about

Submitted by PhotoMan on

Also what can you say about sony's new "Lossless compressed RAW" available in a6700 is it really uncompressed?

Another question i noticed

Submitted by PhotoMan on

Another question i noticed that Nikon Z30 and Nikon Z-50 uses lossy compression however even when i enable Linear Raw Curve i see 16000 shades max that just a bug in RawDigger or its different compression than say Nickon D5600 which reports 4000 shades max per channel when Linear Raw Curve enabled?

Could you please point us to

Submitted by LibRaw on

Could you please point us to the page in RawDigger manual where we use the term 'bit depth'?

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