Please forgive me if this is duplicate. (can't remeber if I sent it already or not)
Lately, I've been suffering from CRS......can't remember S**T! :(( On Fri, 26 Apr 2002 05:02:25 -0500, Samuel W. Heywood wrote: > On Fri, 26 Apr 2002 03:29:35 -0400, Clarence Verge wrote: > <snip> >> Tell him to zip the .BMPs and rename them to .ZBM. > I have heard some stories about a phenomena called > "lossy compression" According to these stories it is OK to zip > images in some formats, but not others. Among those formats that > are supposedly OK to zip are the BMPs. If you zip a JPG and then > unzip it, the resolution will not be as keen as seen in the original > before it was zipped. I don't know if these stories are true and > I have never taken the time to conduct any experiments to see for > myself. If it is true that the phenomena called "lossy compression" > does in fact exist, is the loss of resolution noticeable to the > naked eye? Also, if such a phenomena does indeed exist, how can it > be explained? Two other questions I have are these: Not true. An unzipped file is exavctly the same as it was before being Zipped. Every single byte of it. (pun intended)<g> > 1. If there is such a thing as "lossy compression", could it be > mimimized by using ARJ, ARC, DWC, LHA, TAR, or some other alternative > to PKZIP? None of those formats is "lossy". However... the Jpeg format itself IS "lossy". BTW, It took Clarence quite some time to convince me of that fact. (but I finally DID "see the light")<VBG> > 2. Of the many image formats that we know of, and if it is true that > so called "lossy compression" is a problem in the case of some image > formats, which types should not be zipped? All of them CAN be zipped and then unzipped with no problem what-so-ever. However.... the only format which will end-up-with a significant reduction in size is .BMP All of the rest of them are already compressed just about as small in size as they can get. > It could be that all this talk I have heard about "lossy compression" > is just a bunch of bull, but I tell you that a lot of people believe > it. I won't believe it unless I can find an authoritative source on > the subject which confirms the existence of the reported phenomena. > The truth is out there. Does anyone know the URL? > Sam Heywood > - -- This mail was written by user of The Arachne Browser - http://arachne.cz/ > ------------------------------ -- Glenn http://arachne.cz/ http://www.delorie.com/listserv/mime/ http://www.angelfire.com/id/glenndoom/download.htm http://www.thispagecannotbedisplayed.com/
