Another issue with JPEG and other highly compressed formats is that a
low number of bit errors in the file can result in a completely unusable
image. TIFFs are much more reliable in that single bit errors will
result in single pixel alterations.
-J
Conrad Vogel wrote:
I would warn against saving ANY archival scans with the JPG format.
It is a lossy format which compresses the pixels when saved by
averaging. Then every time you open a JPG and save it again, it
compresses (averages) the pixels once more. files can quickly become
"blocky".
Use a TIF or a PNG for archiving. They are lossless - meaning you
never lose informaion by saving and resaving. When you want to send a
copy to someone or put it on the web, save it as a JPG.
Conrad
Walt Wayman wrote:
I've had an HP S20 for a couple of years and have gotten quite
satisfactory
results from both negatives and transparencies. All my TOPE entries,
except TOPE 1, are slides scanned with the S20 and diddled with only
slightly in Picture Window 2.5 and reduced to TOPE dimensions. Since the
anonymity period is up tomorrow, I'll refer you to TOPE 10, entry 8,
which you have seen and favorably commented upon, thank you, as an
example.
I scan everything at 2400 dpi and save in JPG format. There may be a
problem with your scanner. I hope not, and I wish I could be more
helpful.
Walt
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