Saving a jpeg as a tiff or psd eliminates any further loss of quality
during editing. But, yes, you have no more information than was in the
jpeg to start with. Normally those 16 bit image files only have 10 or 12
bits of information, but remember that is 4x or 16x the information
available in an 8 bit file. However if someone is happy with what they
are getting, I repeat myself:
Good Enough is good enough.
graywolf
http://www.graywolfphoto.com
"Idiot Proof" <==> "Expert Proof"
-----------------------------------
Shel Belinkoff wrote:
But it's not a 43mb TIFF - it's a 6.5mb JPEG. How does a small JPEG turn
into a larger TIFF file containing more information? Once a file is a
JPEG, the information it contained as a TIFF or PSD is gone. Converting it
back to a TIFF won't help it - or will it? In Bob's case, all he shoots
are JPEG's, so the info was never there in the first place. Plus, the file
he provided was a panorama that was stitched together from, IIRC, three
separate files, each being (if my math is correct) a JPEG of only about 2.2
mb. IOW, even though the file was 6.5mb the information it contained was
about like a 2.2mb JPEG ... does that make sense?
In my case, the file starts out as a 16-bit, 120mb or more TIFF, and
remains so throughout the editing process until converted to an 8-bit file
just before being printed. Had I stitched together three files, as Bob did,
the total file size would be closer to 180mb.
Shel
"You meet the nicest people with a Pentax"
[Original Message]
From: David Mann
Bob's file was a jpeg - 5000x3000 pixels (as he mentioned) is a
pretty decent-sized file. That'd be 43Mb as an 8-bit tiff.
