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"Warp" <war### [at] tag povrayorg> schrieb im Newsbeitrag
news:3ca9aeed@news.povray.org...
> > What about writing the same as function in 3.5 ?
>
> How?
Its easy for mosaic filtering and subsequent resizing.
I will write such a macro to avoid future discussions.
But in my eyes correction of gamma, brightness or contrast are much more
bending the rules than the antialiasing methods in discussion.
By the way using Pov-Ray for filter effects one can do some nice effects.
Does anybody know the exact algorithm for Gaussian Blur?
How the image edges are processed?
Norbert
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On Tue, 2 Apr 2002 19:51:42 +0200, "Norbert Kern"
<nor### [at] t-onlinede> wrote:
> By the way using Pov-Ray for filter effects one can do some nice effects.
not exactly blur but uses general method for such kind of effects:
http://news.povray.org/p8r76u08vo673fksp4jaks59h2au3bppkb%404ax.com
ABX
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news:u2sjausb7r0g011em62gir4o87q3561mq0@4ax.com...
> not exactly blur but uses general method for such kind of effects:
> http://news.povray.org/p8r76u08vo673fksp4jaks59h2au3bppkb%404ax.com
>
> ABX
thanx, but I thought more in the direction of a seperate pass for
postprocessing with Pov-Ray.
It is because proximity pattern is extremely useful in some cases, but it is
slow.
Norbert
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On Tue, 2 Apr 2002 20:14:35 +0200, "Norbert Kern"
<nor### [at] t-onlinede> wrote:
> "W?odzimierz ABX Skiba" <abx### [at] babilonorg> schrieb im Newsbeitrag
> news:u2sjausb7r0g011em62gir4o87q3561mq0@4ax.com...
>
> > not exactly blur but uses general method for such kind of effects:
> > http://news.povray.org/p8r76u08vo673fksp4jaks59h2au3bppkb%404ax.com
> >
> > ABX
>
> thanx, but I thought more in the direction of a seperate pass for
> postprocessing with Pov-Ray.
> It is because proximity pattern is extremely useful in some cases, but it is
> slow.
as I said I wasn't reffering to usefulnes of proximity in the subject of this
thread but reffered to general method of applying filters - sampling one pattern
(image_map, object pattern, whatever), then apply some weighting/equation,
subsample if necessary, output new rgb
ABX
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Jaime Vives wrote:
>
> The "artifact" or "moire"
> removing step is done with the previous gaussian filter, and *this is*
> postprocesing, not the resizing.
It's just another resampling filter. Look at the table.
http://www.genaware.com/html/support/faqs/imagis/imagis10.htm
Will all IRTC images that have been resized with other than
nearest neighbour method have to be disqualified now?
_____________
Kari Kivisalo
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Kari Kivisalo <pro### [at] luxlabcom> wrote:
> Will all IRTC images that have been resized with other than
> nearest neighbour method have to be disqualified now?
IMO the rule allowing resizing should be removed (and the FAQ changed
to the opposite of what it's now).
--
#macro M(A,N,D,L)plane{-z,-9pigment{mandel L*9translate N color_map{[0rgb x]
[1rgb 9]}scale<D,D*3D>*1e3}rotate y*A*8}#end M(-3<1.206434.28623>70,7)M(
-1<.7438.1795>1,20)M(1<.77595.13699>30,20)M(3<.75923.07145>80,99)// - Warp -
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Kari Kivisalo wrote:
> It's just another resampling filter. Look at the table.
> http://www.genaware.com/html/support/faqs/imagis/imagis10.htm
Yes, technically speaking, it's a resizing (resampling).
> Will all IRTC images that have been resized with other than
> nearest neighbour method have to be disqualified now?
!? ...why? Resizing is allowed, at least for the moment.
--
Jaime Vives Piqueres
http://www.ignorancia.org/
La Persistencia de la Ignorancia
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<abx### [at] babilonorg> wrote:
>What about writing the same as function in 3.5 ?
My thoughts exactly :) Neither Gaussian blur nor Mosaic should be very
hard to do in 3.5, esp. the latter. With the orthographic camera and
an image_map on a plane in front of the camera, one could almost as
much as make Warp happy :) <ducks>
I haven't really done much in POV recently... maybe I should play
around with image functions and try to recreate the post-processing
filters that were in MegaPOV. If RL permits, that is :(
Peter Popov ICQ : 15002700
Personal e-mail : pet### [at] vipbg
TAG e-mail : pet### [at] tagpovrayorg
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Jaime Vives wrote:
>
> (still, I can't get such good results even using the gaussian blur on
> "The Gimp"... he surely cheated even more! ;).
I tried both Gaussian filters in Gimp and can't get good results.
Use Photoshop :)
_____________
Kari Kivisalo
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Kari Kivisalo wrote:
> Jaime Vives wrote:
>
>>(still, I can't get such good results even using the gaussian blur on
>>"The Gimp"... he surely cheated even more! ;).
>>
>
> I tried both Gaussian filters in Gimp and can't get good results.
Yes, results with the Gimp are only a bit better than +a0.0. Anyhow,
I will surely never use such technique, mostly because more detail on my
images usually helps to make my mistakes more visible... :(
> Use Photoshop :)
Well, I don't have a valid plataform... ;) Also, it's perhaps
excessive for my little use of such programs... since I now use internal
height_fields and rarely use image_maps, I mostly use the Gimp to put my
sig and to convert to jpg.
--
Jaime Vives Piqueres
http://www.ignorancia.org/
La Persistencia de la Ignorancia
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