Evan Lezar wrote:
> I have a quick question regarding this plugin. How do the various
> parameters affect the output? If I simply want a per-pixel difference
> between two images, what should be the field of view settings, for
> example?
You might take a look at
http://www.k-3d.org/wiki/BitmapPerceptualDifference, it has a link to
the source project (pdiff) home-page, which links to some papers. The
idea is that it simulates human physiology to compute a difference
metric based on whether a person could perceive a difference between two
images. Field-of-view combines the effects of display size with
perceiver-distance into a single parameter. If the Field-of-view is
larger, either you're closer to the display, or the display is larger,
so pixel differences are easier to perceive. Larger luminance values
increase the "perceivability" of pixel differences because the
differences become larger in absolute terms.
Having said all that, in practice I think that the parameters don't
affect the outcome much for the relatively small bitmaps we use for
testing - which makes sense, if you blow-up a 256-pixel image onto a
movie-screen, you get pixels the size of post-it notes, so differences
become obvious.
Cheers,
Tim
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