Someone else will have to comment on this! J
Sent from my iPhone > On Apr 27, 2018, at 1:32 PM, Igor PDML-StR <pdml...@komkon.org> wrote: > > > > 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 > > -- > PDML Pentax-Discuss Mail List > PDML@pdml.net > http://pdml.net/mailman/listinfo/pdml_pdml.net > to UNSUBSCRIBE from the PDML, please visit the link directly above and follow > the directions. -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
