William F Pokorny <ano### [at] anonymousorg> wrote:
>
> Hi, Take a look at output file dithering in the documentation. Color
> banding happens due there not being enough color channel depth in most
> any output file format - exr being the exception - for close color
> gradients. And given display / code limitations, you'll sometimes see
> banding with exr viewers too.
>
> The ini settings are Dither=on/off, Dither_Method=??? or you can use the
> flag +th??. Just +th, I believe, defaults to the new blue noise in v3.8
> over an older less robust method. Christoph did a lot of work on output
> dithering for v3.8!
>
> Aside: Dithering is on in the display window which makes POV-Ray itself
> a pretty good image file viewer... I posted some sample as-image-viewer
> code at the bottom of my pgm depth map patch announcement last year
> (asPGMViewer.pov):
>
>
http://news.povray.org/povray.unofficial.patches/thread/%3C5cdd97f8%241%40news.povray.org%3E/
>
>
> which is pretty easily adapted to other image formats. Change the
> image_map gammas to sRGB. The gamma 1 was due the depth map usage. Ah, I
> see too I left in a background statement - harmless, but it shouldn't be
> there.
>
> Bill P.

Thanks Bill, +TH did the trick. It is nearly perfect. I learnt a lot.

I use the pre-compiled 3.7 on Linux. You motivated me to install 3.8 :-)

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