Hey, if it's jpg artifacts you wanna see check my two gallery pages
again (or for the first time) since I've reorganized the webspace. I
removed everything and re-made the jpgs using 50% compression (quality)
on every picture thats not a gif or a small background image. Preview
thumbnails too. It may look kind of disturbing however I managed to cut
the space used in half and speed up the load times by a great deal.
Thinking of doing an exclusive png gallery for the best of the bunch,
giving the viewer a choice. Thank me later ;)


Ken wrote:
> 
> Phil Clute wrote:
> >
> > Being a fairly new pov user I have voraciously toured the many websites
> > available,
> > viewing nearly the entire povray-webring and all the sites in the povray
> > gallery(that
> > were still good links). In doing so I have had the enjoyment of seeing a
> > lot of great
> > stuff. But in my travels(well actually I didn't leave my chair) I
> > noticed on occasion
> > that some objects are surrounded by a kind of ...well... "aura" for lack
> > of a better
> > description. Most often(or maybe it's just me) this effect seems to
> > accompany spline
> > based objects. An example of what I'm talking about can be found at the
> > Colefax
> > website. The Spline Generator page has two images; both have this
> > effect(or maybe
> > I should say artifact). If you run the animation it's a bit more
> > obvious.
> > I am wondering what causes this(mystical enchantment?), and how it can
> > be avoided
> > ("...don't use splines stupid...").
> >
> > --
> > ...coffee?...yes please! extra sugar,extra cream...Thank you.
> 
>   I think what you are seeing is more related to the jpg artifacts
> than any real attribute of using slpines. The Colefax example of
> columns had high values of reflection on it that create bright
> areas around an object that effect how well jpg compression works.
>   The second had a background with a high diffuse value that has
> similar problems. You will find these kinds of unwanted traits
> happen not only with jpgs but also with animations where the original
> 24 bit image is compressed and or reduced in color content. There
> is not much that can be done abuot it other than plan your scenes
> around these limitations. By this I mean don't use areas that abruptly
> go from shiny bright to dark on a objects edge. You get the bright
> objects saturating the pixels around them and it is more visible when
> the surrounding areas are dark.
> 
>   Either that or splines got magic. You make the call.
> 
> --
> Ken Tyler
> 
> mailto://tylereng@pacbell.net

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 omniVERSE: beyond the universe
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