Archived posting to the Leica Users Group, 2006/11/04
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]Elegantly put, Harrison. Now to address Walts scanning comments. We both use the same scanner and shoot the same color film. I have always scanned to tiff on both color slides and bw negatives. I have recently experimented with scanning Velvia to jpg. I can't find any difference at all in the printed output of either file. Also when editing I always save as a level 12 jpg unless I'm mailing a file. There is a huge difference in the file sizes. The tiff is 55 MB versus 15 MB for the jpg. Am i missing something? Len On Nov 4, 2006, at 10:58 AM, Harrison McClary wrote: > Walt Johnson wrote: >> Alastair >> >> One of the things I've notices on the list is people talking about >> jpgs. I was under the impression they were a compression formula >> only suitable for some things. Information lost when opened, >> modified and then closed and then reopened. I've always scanned >> and saved as tiffs which to me is a raw (?) file. Don't get me >> wrong, jpgs are fine for looking at online (computer screens) but >> not whet one wants to print for quality. I've been surprised when >> seeing digital cams using that format to compress space and give >> the impression of vast storage. Wonder how many gigs one could >> squeeze onto a frame of Fuji 50? :-) > > Walt, > > If one opens jpg file edits and saves as a jpg some information is > lost, yes. This all depends on how much compression is used in the > jpg saving. At level 12 you will see no difference in a tiff and > the jpg that has been saved once. For most of my clients who I > have to ftp or e-mail files to I usually go as far as a level 8 as > that still retains most of the image information but makes transfer > times reasonable. Even at level 8 I often am transferring 100 megs > of information to people. > > The key is to not open edit and resave as a jpg. This is why I > shoot RAW when I am sending a jpg file it is a first generation jpg > so it has not lost much information. > I do not know if I explained this very well...I have not had my > coffee yet. > > > -- > Harrison McClary > Harrison McClary Photography > harrison@mcclary.net > http://www.mcclary.net > ImageStockSouth - Stock Photography > http://www.imagestocksouth.com > Tobacco Road: Personal Blog: > http://web.mac.com/whmcclary/iWeb/tobacco-road/Blog/Blog.html > > _______________________________________________ > Leica Users Group. > See http://leica-users.org/mailman/listinfo/lug for more information