Re: Determining the ideal resolution automatically?

Very interesting thoughts, Owen. FFT sounds good, I hadn't thought of
that. I had in mind the rather primitive method of doing internally
the afore mentioned downsample-upsample thing and then compare it to
the original. That would probably lead to similar results anyway.

> Unfortunately it may go gah gah if you have dust or specks in
> the image, the FFT would not "know" you wanted to get rid of those.

Yes, there are some issues. A single grain of dust should not spoil
the system. You would probably need some sort of tolerance/threshold
value. Maybe one that represents the ac***ulation of frequencies
(power?) filtered away. But then you might have small, very acute
zones you want to preserve within a largely blurry image. They might
fall within a global threshold. Then you would have to do some sort of
"local" thing and introduce another parameter. Or, could dust be
detected by its frequency spectrum?
It's not a piece of cake but I believe the problems could be tackled
with a system that is not overly complicated internally or for the
user.

> Exagerating a white piece of paper looks the same at 1 DPI as
> at 1000 DPI!

Good example!

> The FFT won't be in the first version though!

Well, if you are including it in a future version I will be glad to do
some beta testing. :)

Cheers,
Tim