Archived posting to the Leica Users Group, 2014/07/02
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]This file-size difference is intrinsic to TIFF, which interpolates a value for all 3 colors, R-G-B, for each pixel. The X-Pro 1 has a 24-Mpx sensor, 8 million for each of R, G, and B (this is simplified), each of which generates 1 byte of luminance information. So its raw (adjective, not acronym!) file size is 1 byte x 8 Mpx x 3 colors?to a first approximation, 24 MB. If JPEGed for storage, it is re-expanded when viewed. When the image is viewed or printed, software gives each R photosite also a G and a B value by interpolation from adjacent G and B photosites, and likewise for native G and B photosites. So the full image you see in Photoshop should have a file size of ~72MB. TIFF is simply this full file, with interpolated colors at each pixel. That's why it's always generally about 3 x the size of the stripped-down raw file. Differences seen in practice may result from compression, which can save significant storage capacity without loss of information (unlike JPEG). There may be some housekeeping stuff that brings your TIFF file to 4 x your raw; perhaps the file also incorporates a separate raw image. I don't know how this relates to DNG, though. ?howard On Jul 2, 2014, at 1:58 PM, Ken Carney <kcarney1 at cox.net> wrote: > I hadn't really looked either. My X raw files are about 24-27 MB (not > sure what causes the size differential), opening to 94MB Tiff's. My > Canon 5D MkII files are roughly the same raw size, but open to 120+ MB > Tiff's. > > Ken