Archived posting to the Leica Users Group, 2001/07/25

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Subject: Re: [Leica] There IS a "boke" filter!
From: "Juan J. Buhler" <jbuhler@pdi.com>
Date: Wed, 25 Jul 2001 14:34:02 -0700 (PDT)

On Wed, 25 Jul 2001, Mxsmanic wrote:

> That won't work.  You still need depth information, and I don't see any way to
> provide that with the filter you reference.
> 
> > http://www.messia.com/IrisFilter/intro_en.html

Correct. Although there's a lot to say about doing a convolution of an
image with a kernel that resembles a given bokeh.

A "gaussian" blur uses a kernel that approximates a gaussian bell
shaped surface. You can think of a kernel as the "circle of
confusion" to be applied to the image. If instead of the bell shaped
surface you use a flat circle, or a concave one, you can
"worsen" the bokeh (ie, make it more realistic.)  [Anthony, I get the
feeling you know all this already]

But as Anthony says, without distance info or manual selections you
can only apply the same amount of blur to the whole image.

j

- --
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 Juan J. Buhler | Sr. FX Animator @ PDI | Photos at http://www.jbuhler.com
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