Jeff:
ZIP files are lossless compression. That means that you get back
exactly what you put in. That said, for JPG files, the amount of
compression is likely to be near zero since the JPG compression
algorithm is very good. It is useful for saving in a single file a
library of images so they are all together and don't get lost. You
get an index and the ability to extract them one at at time.
For TIF files, the ZIP algorithm will yield significant compression
without loss (unless the TIF has already been stored in a so-called
compressed TIF format.)
For an experiment, try ZIPping a single JPG file and see whether of
not any compression occurs. Sometimes, the resulting file is larger
than the original.
Cheers,
James
At 08:08 AM 10/6/2006 -0400, you wrote:
When archiving digital photo files; does anyone know is archiving
into a ZIP file degrades the picture quality (if you were to extract
the file and print from the extracted file). Is it like a JPEG?
James Schenken
