On 5/24/2010 5:45 AM, Dawid Loubser wrote:
> G'MIC (formerly called GreyCStoration) is amazing at de-screening if you get
> the parameters right, and if
> you're not afraid of the command-line:
>
> http://gmic.sourceforge.net/gimp.shtml
>
> Have a look at this excellent demonstration:
>
> http://cimg.sourceforge.net/greycstoration/img/res_tunisie.html
>
> I have used it for non-linear image scaling, and image in-painting, it's
> really very impressive, with a correspondingly unimpressive user interface.
>
I wasn't about to go through endless iterative command line tries at
this, I installed GIMP, which is much nicer now than last time I tried
it, then G'MIC as a GIMP plug-in. G'MIC is indeed a very powerful tool.
For this particular image, I tried GIMP filter Despeckle, another
plug-in, Descreen and several of the G'MIC filters. Despeckle got rid of
a lot of the screen, but left an overall, obvious pattern effect.
Descreen was better, but blotchy/blobby. It looks like it might be good
on cleaner originals with finer screens.
With the G'MIC filters, I could greatly reduce the screen, while holding
a lot of apparent detail. As far as I could get it to go, though, I had
a choice between much reduced, but still obvious screen or no visible
screen, but a blotchiness. Leaving a bit of screen, applying box blur in
PS to clear that, I though I had done better than with PS alone.
In the end, though, I ended up with maybe a bit more apparent detail,
but at the cost of an unattractive blotchiness. I tried using a mask to
get more detail only in the faces, but finally decided I liked the
slightly smoother version I did and posted before.
I may try Focus Magic, but not this week. I've got mini workshops to
finish preparing for a weekend retreat.
Moose
Moose
--
_________________________________________________________________
Options: http://lists.thomasclausen.net/mailman/listinfo/olympus
Archives: http://lists.thomasclausen.net/mailman/private/olympus/
Themed Olympus Photo Exhibition: http://www.tope.nl/
|