When you open a jpeg, most of the information from the original tiff is
restored along with all of the resolution. The 6.5mb jpeg will produce
the same resolution as the 43 meg tiff. Some information will be lost.
It will probably not be detectable to the human eye if the jpeg wasn't
saved repeatedly.
Paul
On Dec 6, 2005, at 3:22 AM, 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.
