[APML] Interesting Photoshop Plugin

[Jerry Lodriguss <jml@astropix.com>]

Hi,

Free new plugin for Photoshop that lets you create a more complex custom 
convolution filter.

This was posted to the photoshop newsgroup, it might be of interest to some 
here. I have no relation to the company doing the posting.

This custom plugin is free.

There is another free one on the same page that may also be of interest: 
Adaptive Equilization.

Jerry

----------------------------------------------

Subject:
             Downloadable free Photoshop convolution plugin
        Date:
             Sat, 16 Feb 2002 09:51:03 -0500
        From:
             John Russ <jcr5@bellsouth.net>
Organization:
             Bellsouth.Net
  Newsgroups:
             comp.graphics.apps.photoshop, alt.graphics.photoshop, 
alt.graphics.pixutils, comp.graphics.visualization


Photoshop includes a custom convolution filter that allows users to
enter a 5x5 array of integer weights that are multiplied by pixel values
to produce smoothing, derivatives, high pass filters, and other useful
effects. The interactive preview gives immediate feedback on the
results, which is a great assist to learning about convolution kernels
in general, and the operation can also be scripted in Actions for
one-button application to images or for batch processing.

Unfortunately, the Photoshop "Custom" filter has a few significant limitations:
1. only works with 8 bit per channel grey and RGB images
2. applies the kernels separately to the RGB channels
3. is limited to a 5x5 array of integer coefficients, with integer scaling
4. saves and loads files in a special binary format

We've written and are offering for free download and use a very much
enhanced version of this "custom" filter. Like the Photoshop one, it has
an interactive preview, and is recordable in Actions. In addition, the plug-in:
1. supports both 8 and 16 bit per channel grey and RGB images
2. works on the intensity channel leaving hue and saturation unchanged
3. accepts up to a 7x7 array of floating point (real number) values, for
much greater precision
4. can scale the results with a floating point number, or automatically
for maximum unclipped contrast
5. reads Photoshop format files AND ALSO plain ascii tab-delimited text files
6. works in Photoshop and all compatible programs on both Mac and
Windows computers

Encouraged by the response of readers of this newsgroup to our previous
offering of a free plug-in for adaptive equalization, we are offering
this plug-in for free download and use. It is one of nearly 200 plug-ins
in the widely used Fovea Pro package, but can be used without installing
or owning that package.

The plug-in, along with instructions and some example filter files, can
be downloaded as a .sit file for Macintosh or a .zip file for Windows
from <http://www.reindeergraphics.com/free.html#custom>. While you are
there, please take a look at the full range of Fovea Pro capabilities,
which include comprehensive tools for image processing and analysis.
Also, check out some of the other free downloads that are available.

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Jerry



Astrophotography, Tips and Techniques
for Digital Enhancement in Photoshop:
http://www.astropix.com

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