Archived posting to the Leica Users Group, 2006/11/04
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]I have noticed a "convert to DNG" function in Lightroom: If I convert my scanned tiff files to DNG I gain 30 megs over the 130meg tiff file: do I "lose" anything? On 05/11/2006, at 3:31, Leonard Taupier wrote: > 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 > > > _______________________________________________ > Leica Users Group. > See http://leica-users.org/mailman/listinfo/lug for more information