POV-Ray : Newsgroups : povray.documentation.inbuilt : Some stuff related to output file formats : Re: Some stuff related to output file formats Server Time
25 Sep 2021 14:53:20 EDT (-0400)
  Re: Some stuff related to output file formats  
From: Jim Holsenback
Date: 30 Sep 2018 18:09:17
Message: <5bb1498d$1@news.povray.org>
On 9/30/18 5:43 PM, clipka wrote:
> More:
> 
> (7) Output File Dithering:
> 
> The following dithering algorithms are supported:
> 
> + Ordered dithering algorithms:
> 
> - `B2`..`B4`: Bayer pattern dithering using 2x2, 3x3 or 4x4 patterns,
> respectively
> - `BN`: {{New}} in version 3.8, blue noise pattern dithering using a
> 64x64 pattern.
> - `BNX`: {{New}} in version 3.8, same as BN, but using the pattern's
> inverse for the R and B channels.
> 
> + Error diffusion dithering algorithms:
> 
> - `AT`: {{New}} in version 3.8, Atkinson error diffusion dithering
> - `BK`: {{New}} in version 3.8, Burkes error diffusion dithering
> - `D1`: Simple 1-dimensional error diffusion dithering
> - `D2`: Sierra Lite error diffusion dithering
> - `FS`: Floyd-Steinberg error diffusion dithering
> - `JN`: {{New}} in version 3.8, Jarvis-Judice-Ninke error diffusion
> dithering
> - `S2`: {{New}} in version 3.8, Two-Row Sierra error diffusion dithering
> - `S3`: {{New}} in version 3.8, Three-Row Sierra error diffusion dithering
> - `ST`: {{New}} in version 3.8, Stucki error diffusion dithering
> 
> [Not for docs: Absence of extra memory requirements info is deliberate;
> the extra memory should be negligible in all but highly pathological
> cases. Also, current info is no longer accurate, as requirements for D2
> and FS have changed.]
> 
> {{New}} in version 3.8, the default is `-THbn`, i.e: dithering is off,
> with `BN` being the default if only `+TH` is specified.
> 
> {{New}} in version 3.8, dithering is fully gamma-aware, i.e the overall
> apparent brightness of the resulting image is faithfully reproduced.
> 
> 
> (8) Preview Window Dithering:
> 
> In v3.8, the preview window always uses blue noise dithering [this was
> Bayer 4x4 in v3.7, but I can't find it documented anywhere except in the
> change logs].
> 
> 
> 
> I intend to write up a short(-ish) dithering tutorial based on the (new,
> to be pushed soon) `distribution\scenes\output\dither_showcase.pov`
> sample scene, but anyone willing to pick up that glove would be welcome.
> 
lol...quit piling it on. i'm starting a 14 day run today at work and my 
time will be spotty


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