The information lost is never retrieved anymore, its gone forever. It is information lost during compression, and the image is changed because of that. While creating a jpg you can choose the compression quality, the better quality, the less data is gone and the bigger the file will be after compression. As long as you want to edit your files you should not store them a jpg because of that, each time you save after changes you lose information. Keep using a lossles format as TIFF or PSD.
On Sat, 2003-12-06 at 23:17, Shel Belinkoff wrote: > If the information is lost when creating a JPEG file, where does it come > from when converting the JPEG to PSD or TIFF? Or is the "lost" > information never retrieved, and only the file is decompressed less some > information? > > Frits W�thrich wrote: > > > > This happens because the information is de-compressed. JPEG images are > > compressed, and information is lost in creating them because of the > > lossy compression. > > During de-compression no information gets lost further, it just gets > > inflated back to the original file size. > > > -- Frits W�thrich <[EMAIL PROTECTED]>
