you might be interested in lurawave plug-in into irfanview. it can compress images up to 4k x 4k pixels. you have to have a fast computer though. the algorithm is based on wavelet compression (see jpeg2000 specs). hardware based decoding chips are at least two to three years away.
lemuel ragasa "Mark T." wrote: > At 04:06 AM 21/10/01 -0600, Bill wrote: > >... > >o The JPEG standard includes a lossless setting. Photoshop 6 supports it: > >set the quality level to 12. it will compress to, say, 1/3 of the original > >size. JPEG only supports 24-bit images. > > G'day Bill. > > I had never heard of a lossless JPG, so I checked the JPEG FAQ, which > basically says that there *was* an early version of a lossless JPEG, but it > never took off. They also referred to a new standard called JPEG-LS - is > this what you meant? I couldn't see anything about it in the PS Help file, > but I only took a quick look. I would be most interested if PS6 really > does supprt a lossless JPG.. As far as I knew, the main players were/are: > > TIFF > - 48-bit, lossless, large files > > TIFF with LZ compression > - As above but files can be much smaller (esp if image is not grainy or > detailed), eg typically 1/2 to 1/5 original size > > JPEG > - 24-bit, lossy but adjustable. File sizes often less than 1/5 of the > uncompressed TIFF (depending on quality setting and image content) > > PNG > - 24-bit, lossless. File sizes usually a bit smaller than compressed TIFF, > but not as small as JPEG. > (PNG's are also readable by most browsers, which makes them useful for > 'critical' web-display.) > > FWIW, I always use TIFF without compression if in any doubt (I have had > quite a few problems with lack of portability of LZ'd TIFs), and I am now > moving over to PNG's for my own file storage in order to save CD > space. The lack of 48-bit quality hasn't yet been an issue for me.. > > mt
