[Radiance-general] RE : how to use pfilt to perform anti-aliasing

[Ji Zhang]

Dear Raphael,

Thanks for your prompt reply and advice!

Does this mean that I may need to bear in mind that the size of the image to
be produced by rpict should always be 3 times bigger than the size of the
final image I want?

Cheers, Ji



2011/6/14 Compagnon Raphaël <Raphael.Compagnon at hefr.ch>

> Hi
>
> To perform anti-aliasing you need to reduce your final image size
> (typically by a factor 3).
> Hence your pfilt comand should be:
>
> pfilt -x /3 -y /3 -e 1 -r 0.55 ./direct_sunlight.hdr > test.hdr
>
> Raphael
> ________________________________________
> De : Ji Zhang [hope.zh at gmail.com]
> Date d'envoi : mardi, 14. juin 2011 08:36
> À : Radiance general discussion
> Objet : [Radiance-general] how to use pfilt to perform anti-aliasing
>
> Dear Radiance experts,
>
> I use pfilt to treat a .hdr image generated by rpict command.
>
> However, the the pfilt doesn't seem to have any impact in terms of
> anti-aliasing of the image.
>
> The pfilt command I used is:
> pfilt -x 1024 -y 1024 -e 1 -r 0.55 ./direct_sunlight.hdr > test.hdr
>
> the original .hdr image (saved as png file) is:
>
> http://i1143.photobucket.com/albums/n633/oatcracker/Radiance/direct_sunlight.png
>
> the output .hdr of the pfilt (saved as png file) is:
>
> http://i1143.photobucket.com/albums/n633/oatcracker/Radiance/output_of_pfilt.png
>
>
> Can you kindly tell me if I'm using pfilt correctly to perform
> anti-aliasing?
>
> Thanks!
> Ji
>
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