Archived posting to the Leica Users Group, 2006/11/04
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]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