Interpolation is mathmetically filling in missing points from sampled data. For
example lets say you go out and measure the position of the moon every 15
minutes. You don't actualy know where the moon was in between those
measurements. But you can guess. The simplest interpolation would be a straight
line between observed samples. For example if you observe that the moon is at 20
degrees at 2:30 and 22 at 2:45, then you can guess that it was at 21 degrees at
2:37:30. (I am making the measurements up, but you get the point.)
When you blow up a digital picture one of your options is to make all the pixels
bigger. This generally looks hideous. Another option is to move the pixels you
have to where they would be in a larger picture, and then to fill in all the
white space by interpolating the values that are in between your original
pixels.
I don't know what kind of model photo shop or similar would use, but I imagine
it would be more sophisticated then a straight line.
Date: Tue, 17 Dec 2002 10:52:06 -0000
From: "IanG" <I@xxxxxxxxxxx>
Subject: RE: [OM] Digital vs. film
I sent off some files for 10x8 printing on a Fuji Frontier and have not been
too impressed.. they are 'better' than I get off my Epson 880 but not enough
to really justify the effort.
The guy who printed them asked whether the file were interpolated - can
anybody explain what that is / how and why it is done please - and also
suggested that I leave sharpening to him. I don't doubt the guys sincerity
at all, just trying to understand why.
Does anybody have an idiot's guide to getting quality prints from digit
files? I've got the files to where I want, I need to improve print quality.
Ian
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