Re: [Gimp-developer] Question about Neon Edge Detection Feature

["Joao S. O. Bueno" <gwidion gmail com>]

Hello David --

Thank you for your compliment and sharing your work - but
these lists do not accept e-mail attachments - they are automatically removed.

You will have to find a web page and upload your work there, and share
the links.

You might also be interested in sending the links to gimp-users list,
so as to reach
a broader audience.


As for the filters: They are pure mathematical  operations, and are
actually simple in nature.
They are specific kernel convolution operators (at least most of them
- maybe one or other of
GIMP's algorithms include some other step, like coloring up the results).

You can read more about this type of operation here:
http://en.wikipedia.org/wiki/Kernel_(image_processing)

And most importantly - you can try different custom convolutions in GIMP using
the generic convolution filter you can find at
"Filters->Generic>Convolution Matrix"

Regards,

  js


On 2 March 2015 at 14:22, Rosenthal, David <drosen citysoftinc com> wrote:
> Hi, I have been using GIMP for about 5 years and love working with it.
> Thank you to all who have made this wonderful tool possible.
> I use the edge detection filter a lot on cloud formations. Sometimes I get
> results so fantastic, I wonder if there is any 'intelligence' coded into
> the filter to create meaningful forms out of random data, or , is it really
> finding something that we can't see. I enclose a couple of particularly
> apocalyptic results.
> I've tested many combinations , including applying equalization, levels,
> invert etc but the best results are a simple NEON edge filter with settings
> of 9/.3.
> I am attaching the original photos and their 'neoned' results (using the
> Spencer Kimball plugin - which gives simiar results to directly running the
> Neon Edge Filter in GIMP 2.8). I reduced the size to make the overall email
> smaller. (All photo's by the way are unretouched, including ...1846 which
> seems to show a few weird things in the original photo: person  sitting on
> cloud reading a book at about 3 o'clock along with something billowing out
> clouds.)
> Is it just me that gets these apocalyptic images ? (not just from clouds
> too!)
> I would be interested in any comments you may have on this Is question.
> Thank you very much.
>
> *- david *
>
>
>
>
>
> *Regards,David Rosenthal*
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