On 10/09/06, Shel Belinkoff <[EMAIL PROTECTED]> wrote: > Rob, > > I've tried compressing TIFF files made from PEF files. They invariably end > up a little larger than the converted TIFF file. Others have also reported > similar results. Are you able to compress a TIFF and get a smaller file as > a result? I'd love to know how you do it.
An uncompressed TIFF file (converted 1:1 pixels) will always be larger than its parent PEF, the former will be a 24 or 48 bit per pixel file whereas the PEF consists of an uncompressed 12 bit per pixel TIFF + a low res JPG file. When compressing any file the detail level it contains will be the major factor in the degree of compression that can be obtained for any particular compression quality level. In other words a TIFF produced from PEF of a dark frame (with NR on) will inevitably compress more effectively that a sharp image of some sand. Just to confirm are you speaking of enabling LZW compression in the TIFF or zipping a TIFF after saving it? Cheers, -- Rob Studdert HURSTVILLE AUSTRALIA Tel +61-2-9554-4110 UTC(GMT) +10 Hours [EMAIL PROTECTED] http://home.swiftdsl.com.au/~distudio//publications/ Pentax user since 1986, PDMLer since 1998 -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net
