On Fri, Apr 27, 2018 at 04:32:23PM -0400, Igor PDML-StR wrote: > > 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).
The TIFF 6.0 specification allowed for a variety of image decoders (such as, for example, those used in CCITT FAX), including proprietary decoders. The overall architecture of a DNG file (and, IIRC, a PEF file) conforms to the TIFF 6.0 specifications (using TIFF tags to describe the organisation of the file, for example), but the actual image data requires a decoder which is not part of the TIFF standard. The DNG standard adds a few extra decoders to the TIFF standard, including one for the Bayer RGGB pattern. While the *ist-D did offer TIFF, it wasn't really a raw format - although the *ist-D had a sensor that could record 12 bits of data, the TIFF output was limited to 8 bit. The PEF output retained all 12 bits (although the sensor data was stored in a 16-bit format, with no compression, leading to fairly large files - looking at a few of my images when I was testing my *isdt-D show .PEF files of around 14MB, and .TIF files of around 18MB). I've used DNG as my RAW format since I moved from the *ist-D to a K10D. -- 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.
