Date sent: Sun, 09 Jun 2002 18:59:45 -0400 Send reply to: [EMAIL PROTECTED] From: "Johnny Johnson" <[EMAIL PROTECTED]> To: [EMAIL PROTECTED] Subject: [filmscanners] Re: Archiving and when to sharpen(was:Color spaces for differentpurposes)
> At 05:32 PM 6/9/02 -0400, Mac wrote: > > >Wow, are you sure? The LZW TIFF was *larger*? > >That's unusual. > > Hi Mac, > > Thanks for asking - it looks like the original TIFF file that I grabbed > must have already been saved with lwz compression. So, I did the > experiment again using a fresh scan of a different slide with the following > results: > > TIFF: 56,264 kb > TIFF with lzw compression: 35,364 kb > JPG with Photoshop level 12: 18,453 kb > > So, in both this case and the previous one, the JPG with level 12 > compression is ~ 1/2 the size of a TIFF with lzw compression. > > Thanks again for bringing my mistake to my attention, > Johnny That makes more sense. Contrary to what Anthony Atkielski wrote, I have NEVER seen a LZW Tiff come out larger than an uncompressed one, regardless of exact pixel content. I have also never seen a compressed TIFF come out equal to or smaller than a JPEG at the same pixel dimensions, regardless of how how the quality setting of the JPEG. The only time I've seen a compressed file come out larger than a non-compressed one is when using .zip on a JPEG. Mac McDougald -- DOOGLE DIGITAL 500 Prestwick Ridge Way # 39 - Knoxville, TN 37919 [EMAIL PROTECTED] 865-540-1308 http://www.doogle.com ---------------------------------------------------------------------------------------- Unsubscribe by mail to [EMAIL PROTECTED], with 'unsubscribe filmscanners' or 'unsubscribe filmscanners_digest' (as appropriate) in the message title or body