[Radiance-general] -ar parameters

[Fitzsimmons, Rob]

I'm trying to understand the -ar parameters
I'm thinking thats what behind the artifacts in between the couch cushions
in this image
http://rastermon.com/Rad/image/july1_livdbig.jpg
Unfortunately, I don't have the actual -ar value used with me now (I'm at
work) -- I used a rif with high quality, so I'm thinking it  was around 93

Acording to this page,
http://radsite.lbl.gov/deskrad/param_table.htm
-ar minimum value is 8, fast is 32 and accurate is 128, yet maximum is 0. So
if I want better quality than 128, can I go to 256, 512, etc or is 0 the
value I should use?

Or is that max 128 only in Deskrad?

>From the Radiance manpages, rpict -ar
Error will start to increase on surfaces spaced closer than the
scene size divided by the ambient resolution. The maximum ambient value
density is the scene
size times the ambient accuracy (see the -aa option below) divided by the
ambient resolution.

This seems to imply you can set it higher than 128, and also decrease the
-aa

thanks

rob fitz