<Tim.Ahrens@[EMAIL PROTECTED]
> wrote: Some of the images I have (some photos, some
scans) are slightly
> blurred, some more, some less. So, I can reduce the resolution
> practically without loss of information. To be sure, I typically
> reduce the resolution, then increase the resolution back to the
> original and if there is no visible loss of information compared to
> the original image I know that the resolution was not too low. It
> typically takes a few attempts to find out how far I can go.
>
> My question is: is there a tool that does this job automatically?
^^^^^^^^^^^^^^^^^^^^^^
Your objective is very clear, and I don't see why it is so difficult for
some people to grasp it.
The first obstacle I see to your goal is in the fact that you are doing
this
visually. Your determination of the least acceptable resolution is based
on
your ability to see and judge when a picture has been degraded. Some
people
will be better at this than others, but in every case it will be a
judgment
call. Can it be done by a computer?
Secondly, you recognize that the blurriness of the image comes from two
separate sources: 1.) The image itself, as created by the lens, and
limited by the steadiness of the camera, movement of the subject, and even
waviness in the air. 2.) The way the image is divided into pixels,
either
by the camera or the way you store it. I believe these two effects
interact. It's not enough just to exceed the sharpness of the original
image by your pixel density. As you cut the pixel density looking for the
most economical value, it will not be a sharp cutoff--it will be a curve,
which causes the image to get blurrier over a range.
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