Re: Determining the ideal resolution automatically?

On Wed, 30 Apr 2008 03:46:10 -0700 (PDT), Tim.Ahrens@[EMAIL PROTECTED]
 wrote:

>My question is: is there a tool that does this job automatically? I
>mean, in a blurry image, determining what the "real" resolution is and
>then downsample automatically? Sorry if this has been asked before, I
>couldn't find anything.

Going highly technical but I suppose you'd need a program which
did a 2D Fourier Tranform on the image to find out the highest
spatial frequencies which exist in the image. That would tell 
you the max sampling size you'd need in x and y axes, and hence
the number of pixels in x and y.

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.

I understand your reasoning because I've thought about this myself
with a scanning application I am writing. Why store at 1200 DPI
an image which is has exactly the same data at 200 DPI (scanned
DPI I mean).

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

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


Easy to use graphics effects:
http://www.ransen.com/