Krita PRNG (minor nit)

Cyrille Berger cberger at
Tue Mar 3 23:49:45 CET 2009

On Tuesday 03 March 2009, Matthew Woehlke wrote:
> Matthew Woehlke wrote:
> > I'm comparing notes now, will see if I can comment on the 'noticeable
> > pattern' mentioned in r934614; it may be a while before I can look
> > though as I am doing a full rebuild due to the qt-copy update.
> Strictly looking at the code, I would guess it would help if the input
> wasn't 'x + y * a' (where 'a' is a relatively small number). As I recall
> from early experimentation, that's why I wanted the input number to be
> somewhat random-noise on its own, i.e. why I throw big numbers at the
> coordinates before feeding the resulting scalar to the meat-grinder.
Might explain why I get a reapetitive patter on bigger image. Will try with a 
bigger number.

> I'm curious where the current algorithm came from? (Also if there is any
> reason for not using my latest suggestion other than that it does more
> operations per pixel?)
it does less operations :)
I also get confused by your use of the generator in the noise filter, which 
doesn't fit with what is currently done. So I wasn't sure if your algorithm 
would fit the filter.

Cyrille Berger
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