18 May
2015
18 May
'15
12:57 p.m.
On May 18, 2015, at 3:36 PM, Fred Cisin <cisin at
xenosoft.com> wrote:
...
(and, of course, I have encountered academics who would rather scan a photograph at
200dpi and then store with LOSSLESS compression rather
that a scan at 1200DPI stored with LOSSY compression)
And, depending on the source material and intended usage, that may be the correct
decision. The 1200 DPI JPEG scan will have compression artifacts, which may corrupt the
image to the point that its intended use can no longer reliably be achieved. Or it may
be, provided the compression parameters are set correctly. By contrast, scanned images
stored with lossless (or, equivalently, no) compression have properties that are likely to
be better understood and more consistent. If you?re doing astronomy, or radiology, or
other activities where small spots on the image have meaning, this sort of thing may well
be important.
paul