Photoshop convolution filters
Photoshop convolution filters
- Subject: Photoshop convolution filters
- From: "Fred Bunting" <email@hidden>
- Date: Fri, 7 Sep 2001 21:49:37 -0700
- Thread-topic: Photoshop convolution filters
Please excuse the non-ColorSync question, but a colleague has a
question about Photoshop convolution filters, which is just not
my field. However, I figured there were some Photoshop lurkers
on this list who might redirect Benjamin to the right place.
Any redirection would be appreciated:
Here is his question:
----------------
Photoshop and other sophisticated image processing software offer
a thing technically called a convolution, where a matrix of numbers
provide a way of defining what an output pixel will be relative
to its neighbors. Eg, a simple blur will average a pixel with all
eight of its neighbors. A Gaussian blur (I think) is a weighted
average over a larger area; pixels nearer the center count more
than those further away.
I've done some Googling on the subject, and been able to find a
few isolated examples of interesting convolution matrices, and
some highly technical math pages about them.
From what I've read, many "filters" are really just applying
a particular convolution filter: sharpen, blur, Gaussian blur,
edge detection, etc.
I'd like to know if there are any webpages that have extensive
catalogs of interesting matrices. I would also be interested in
not-overly technical descriptions of how to make interesting
matices. Does anyone know of such pages?
Benjamin
---------------
End of question.
We now return you to your regularly scheduled program:
"Days of Our Profiles".
Fred Bunting