On: Mon, 17 Feb 2003 Shangara Singh wrote: >> Resizing Jpegs is not considered a good idea because they are lossy. With >> digital stock delivery there will nearly always be one conversion from the >> 55Mb Tiff to a jpeg of suitable size for transmission. > > I just did the following: Opened a TIFF saved from a RAW file. Made a copy > and saved it as a full quality JPEG (equivalent of sending a JPEG to an > library). Closed it, opened it and then saved it as a copy (equivalent of > them converting from a TIFF). Closed it and opened both JPEGs and dragged > them into the TIFF's window. Turned the layers on and off of the two JPEGs > and can see absolutely no difference at 100% between the two JPEGs or when > either one is compared to the TIFF layer.
Yes, no difference - until further pixel mashing - then the JPEG compression matrix starts to reveal itself. This effect is inversely proportional to the amount of destructive pixel editing done prior to compression. JPEG compression is only useful in its practical sense, and is not a panacea solution for data storage. Hope this helps in what is an interesting thread. best William Curwen =============================================================== GO TO http://www.prodig.org for ~ GUIDELINES ~ un/SUBSCRIBING ~ ITEMS for SALE
