Digital BW, The Print

Bob,
I think the test you created is interesting, but not directly useable for
evaluating interpolation routines.
Vertical B/W lines one pixel wide is right at the nyquist limit for spatial
frequency.  Pushing that data through any filter will look rather messy
compared to more “picture” like image data.  For example, a headshot
portrait and willow tree without leaves may “look” better up-sized and
sharpened using different routines.  On the other hand, if the headshot is
of a lion, and you have the whiskers in focus, maybe not. :-)

Best regards,
John Moody

-----Original Message-----
From: DigitalBlackandWhiteThePrint@yahoogroups.com
[mailto:DigitalBlackandWhiteThePrint@yahoogroups.com]On Behalf Of Bob Frost
Sent: Wednesday, September 07, 2005 4:30 PM
To: DigitalBlackandWhiteThePrint@yahoogroups.com
Subject: Re: [Digital BW] Stair interpolation - was Genuine Fractals

Paul,

They do, but as I said using Bicubic simply blurs the bands - they are still
there. Try it yourself, it only takes a few moments.

Bob Frost.

----- Original Message -----
From: "Paul D. DeRocco" <pderocco@...>

Sure, if you use Nearest Neighbor. But I'm under the impression that the
various stairstep upsampling actions that people gush about use repeated
iterations of Bicubic.





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