I guess this requires a bit more careful discussion of what TIFF is.
TIFF is a rather broad format. Strictly speaking it is a container format
that can have images incorporated in a variety of formats, including JPEG.
https://en.wikipedia.org/wiki/TIFF
This format is described in the TIFF 6.0 format standard.
AFAIK, originally, it (the "classic" TIFF image) did not allow a RAW
image incorporated (but I am not 100% confident here).
There is, however a later format standard, so-called, ISO 12234-2, known
as TIFF/EP. https://en.wikipedia.org/wiki/TIFF/EP
(But it is not the same as the "TIFF" standard! - defined as TIFF 6.0
standard.)
One of the purposes/uses of this format is the RAW image format (for
storing sensor information from different devices: scanners, digital
cameras, etc.)
To make that more clear, we have to define what RAW format is: it contains
information (recorded signal levels) from each individual sensor site
(e.g. for R, G, G, and B in various orders - for Bayer-filter based
sensors). That is before it gets mixed into color-pixel information. That
allows more efficient color separation/tweaking/mixing then at the level
of pixel-based images.
The non-RAW formats (Jpeg, "classic" TIFF, etc.) contain
information about each pixel's color. This are based on the bitmap, - in
some cases possibly compressed in a lossy or lossless way.
Nikon's NEF _is_ _based_ on TIFF/EP format, but, again, it is not the
TIFF format: http://lclevy.free.fr/nef/
DNG was also based on TIFF/EP format.
Now, as far as I understand, "traditional" TIFF viewers would not be able
to show any RAW formats: you'd need some sort of additional
"decoder"/converter from the RAW format to the bitmap-based format.
I've never carefully looked at the TIFF files used by *ist-D and *ist-DS,
but I suspect that was a "traditional" TIFF format, that can be easily
seen in any TIFF viewer. So, I don't think that was a true "RAW" file.
If you chose that format as output, - you were not storing RAW image,
similarly to how it is not stored when you store JPEG-only.
I suspect it is because of the structure similarity ("Tags-based format:
Tagged Image File Format - TIFF") that some software might mix up RAW for
TIFF. And I saw that some piece of software had a bug like that:
https://bugs.launchpad.net/ubuntu/+source/file/+bug/77166
Also, because both TIFF (6.0) and TIFF/EP have "TIFF" in the name, and
because the latter is based on a subset of the "original" TIFF, - people
often incorrectly combine both under the same "TIFF" umbrella. Hence,
the confusion.
I hope this somewhat clarifies this rather messy multitude of image
formats and nomenclatures.
Igor
Mark Roberts Fri, 27 Apr 2018 11:27:32 -0700 wrote:
John Francis wrote:
The only thing I would add to Igor's excellent summary of the
various file formats, camera option settings, etc., is to
mention that TIFF was, in fact, available as a RAW format on
the Pentax *ist-D and *ist-DS.
I was under the impression that DNG and most other raw formats were
variations/extensions of the TIFF format. Indeed, some image recovery
software will find raw files if you specify TIFF as the format to
search for.
--
Mark Roberts - Photography & Multimedia
www.robertstech.com
On Fri, 27 Apr 2018, Igor PDML-StR wrote:
Jack,
Your question confused me.
What "organizer"? Which TIFF images?
I don't think I understand all the aspects of your question, but I hope the
following clarifying statements would at least partially answer it.
1. TIFF is not a raw format. So, I doubt it'd be produced in the camera.
Maybe as an "export" option, but even that is unlikely.
2. DNG _is_ a raw format.
3. I am not aware of RAW+DNG format option in any camera.
4. With modern Pentax DSLRs, you can choose one of the two RAW formats:
"PEF" (Pentax proprietary) and DNG (Adobe's).
5. With the last several generations of Pentax DSLRs, you can choose
RAW or RAW+JPEG as the default, or override that manually with a button.
If you choose RAW+JPEG, you get two files written.
Here is a brief description of these file formats:
https://www.dpreview.com/forums/post/41321715
HTH,
Igor
Jack Davis Fri, 27 Apr 2018 08:10:06 -0700 wrote:
Anyone,
Am not seeing a RAW converter when downloading recent TIFF images from the
organizer. I was advised to change a new camera setting from RAW to RAW+DNG.
I did so. Should I now be seeing a DNG TIFF converter?
Thanks
J
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