Digital BW, The Print

The dpreview article mentioned below may have been where I saw a series of
images that compared the various methods.  I really could not see
significant difference among the top half of the approaches, which included
GF.  But, as mentioned before, the nature of the image makes a difference.

I use GF to up-sample images where I must.  It seems to avoid stair-stepping
and preserve sharp edges reasonably well. No doubt the state of the art has
advanced now; I have not tried s-spline but have seen dramatic comparisons
to bi-cubic.  

My conclusion, however, is that these programs are just marginal
improvements to images that really needed to start as higher resolution
files in the first place.  There is no magic here and no substitute for good
initial information capture and scanning.  The programs cannot, in my
experience, manufacture fine detail that looks real.

Paul
www.PaulRoark.com 


> -----Original Message-----
> From: DigitalBlackandWhiteThePrint@yahoogroups.com
> [mailto:DigitalBlackandWhiteThePrint@yahoogroups.com] On Behalf Of
> brucenorikane
> Sent: Thursday, August 18, 2005 5:53 AM
> To: DigitalBlackandWhiteThePrint@yahoogroups.com
> Subject: Re: [Digital BW] Genuine Fractals
> 
> "john dean" <deanwork2003@y...> wrote:
> ...
> > It certainly would be nice to take the same file and res it up
> > different ways to do a comparison test. I'll be glad to do the Miranda
> > test of it and or PSCS2.
> 
> there was a great thread on DPReview that compared interpolated
> images.   The images were in the thread.  People discussed and voted
> on their favorites. The voting was not unaminous, but Qimage's vector
> (test was before pyramid availability) and GF seemed to score highest.
> the thread is still there, but the images seem to have disappeared:
> 
> http://forums.dpreview.com/forums/read.asp?forum=1003&message=7642362
> 
> There is a followup posted by Qimage's Mike Chaney that compares his
> newer pyramid interpolation to several others:
> 
> http://forums.dpreview.com/forums/read.asp?forum=1003&message=7642362
> 
> 
> 
> 
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