Apophysis grainy

[ccb]

I have used other fractal programs and have seen beautiful crisp Apophysis images.  Whenever I render one from Apo 7X, it always comes out grainy looking like this - http://cbrundage.net/apo.jpg  It must be some very basic thing I am doing wrong.  I have W10, gaming level computer, I use the settings I've seen recommended for rendering (10,000 density, 0.4 filter radius, oversample 2).  What am I doing wrong?  Thanks for any help!!

[TheRedshiftRider]

I think this is the problem you are having:
https://en.wikipedia.org/wiki/Moir%C3%A9_pattern

I don't know how to solve it though. I would have tried to render a large image and then scale it down. but I see you've already tried that. The wiki page might contain useful information which could help you.

[ccb]

Thanks for replying.  A friend who is very fractal knowledgeable is going to give me step by step instructions in how to remedy it, so I guess it isn't a simple solution.

[lycium]

To reduce the grain in Apo images, you have to increase the "quality" parameter; a value of several thousand can often be needed.

Besides this, Apo uses some quite old rendering algorithms, and doesn't have particularly good anti-aliasing / final image quality; if you're interested, I develop an alternative (commercial) program aimed at making high quality IFS / flame fractal renders: http://www.chaoticafractals.com