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Hi everyone,
I have been having a problem with my display for a while now, but it
has gotten to the point of annoyance recently. My problem is that any
time I view a picture made with Povray, I see bands of color where there
should be a smooth transition. I have figured out that it probably has
something to do with my video card/settings. I have a 1mb card that is
set at 800x600 16 bit, the highest it will go right now is 640x480 24
bit. I have also found a solution: open the pics up in Paint Shop Pro
and convert them to 24 bit color with error diffusion. This is a little
too much work to do while looking at pictures on a web page however. I
believe that I am probably not the only one who has had this problem. I
would like to know if there are any possible solutions short of
upgrading my card?
Sirrus
PS. I know that this has more to do with video cards than Povray, but I
like you guys better. :)
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Sirrus wrote:
> Hi everyone,
>
> I have been having a problem with my display for a while now, but it
> has gotten to the point of annoyance recently. My problem is that any
> time I view a picture made with Povray, I see bands of color where there
> should be a smooth transition. I have figured out that it probably has
> something to do with my video card/settings. I have a 1mb card that is
> set at 800x600 16 bit, the highest it will go right now is 640x480 24
> bit. I have also found a solution: open the pics up in Paint Shop Pro
> and convert them to 24 bit color with error diffusion. This is a little
> too much work to do while looking at pictures on a web page however. I
> believe that I am probably not the only one who has had this problem. I
> would like to know if there are any possible solutions short of
> upgrading my card?
>
> Sirrus
>
> PS. I know that this has more to do with video cards than Povray, but I
> like you guys better. :)
Take a look at the pov VFAQ. I think you will fine the answer to your
question there.
http://www.students.tut.fi/~warp/povVFAQ.html
If not come back, slap me, and we will try it again. ; )
Ken Tyler
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It is your video card. I ran into this problem with my IRTC entry which
used atmosphere... after jacking samples up near 2000, I finally tried
to change my color depth up to 24bit. The problem is that the output is
24bit and the video card is displaying 16bit without dithering down.
There really isn't a solution, but if you are running under 24bit color,
there isn't a problem either (you need a card with 2 megs for 800x600 at
24bit and 4 megs for 1024x768... well you really only need 3, but they
don't sell them like that..)
Steve
Sirrus wrote:
>
> Hi everyone,
>
> I have been having a problem with my display for a while now, but it
> has gotten to the point of annoyance recently. My problem is that any
> time I view a picture made with Povray, I see bands of color where there
> should be a smooth transition. I have figured out that it probably has
> something to do with my video card/settings. I have a 1mb card that is
> set at 800x600 16 bit, the highest it will go right now is 640x480 24
> bit. I have also found a solution: open the pics up in Paint Shop Pro
> and convert them to 24 bit color with error diffusion. This is a little
> too much work to do while looking at pictures on a web page however. I
> believe that I am probably not the only one who has had this problem. I
> would like to know if there are any possible solutions short of
> upgrading my card?
>
> Sirrus
>
> PS. I know that this has more to do with video cards than Povray, but I
> like you guys better. :)
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Sirrus wrote:
>
> Hi everyone,
It's your video mode. Change it to 24 or 32bit and it will go away.
Realize this: that in 8bit mode you have a choice of 256 color out of a
pallette 262144 colours (rgb 6:6:6b). In 15bit you have 32768 colours
out of a pallete of only 32768 and in 16bit you have 65536 colours out
of 65536. This means you have a smaller palette with 16bit than in 8bit.
:) In other words, you have a relatively limited palette in 16bit
compared to even 8bit. Even more so compared to 16,777,216 in truecolor
24bit mode.
--min
> Sirrus
>
> PS. I know that this has more to do with video cards than Povray, but I
> like you guys better. :)
--
Lewis A. Sellers: writer and contract Multimedia Website Developer
mailto:lse### [at] usit net (The Fourth Millennium Foundation)
http://www.public.usit.net/lsellers/ & http://www.fourthfoundation.com
http://brain-of-pooh.tech-soft.com/users/critters/bios/sellers_lewis.html
You can bug the living bejesus out of me live on ICQ @ 491461
(If I don't get back to you within a month, I'm out of prozac in some
dark corner somewhere screaming things quite unintelligable but -- most
curiously -- thick with a sumerian accent.)
"The comedy is over" -i pagliacci
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In POV-Ray, go to the 'Options' menu, click on the 'Render Window' submenu, and
make sure that 'Force 8 bit display' is not checked. You may have accidentally
turned it on with alt-8.
-Nathan
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Lewis Sellers <lse### [at] usitnet> wrote in article
<361985AC.9E872B94@usit.net>...
> Sirrus wrote:
> >
> > Hi everyone,
>
> It's your video mode. Change it to 24 or 32bit and it will go away.
>
> Realize this: that in 8bit mode you have a choice of 256 color out of a
> pallette 262144 colours (rgb 6:6:6b).
It's hair splitting, but, isn't 8bit 256 out of 16,777,216 ?
--
Scott Hill
Sco### [at] DDLinkscouk
Software Engineer (and all round nice guy)
Author of Pandora's Box
Company homepage : http://www.ddlinks.demon.co.uk
"The best trick the devil ever pulled was convincing people he didn't
exist..."
- Verbal Kint.
"the Internet is here so we can waste time talking about nothing in
particular when we should be working" - Marcus Hill.
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Scott Hill wrote:
>
> Lewis Sellers <lse### [at] usitnet> wrote in article
> <361985AC.9E872B94@usit.net>...
> > Sirrus wrote:
> > >
> > > Hi everyone,
> >
> > It's your video mode. Change it to 24 or 32bit and it will go away.
> >
> > Realize this: that in 8bit mode you have a choice of 256 color out of a
> > pallette 262144 colours (rgb 6:6:6b).
>
> It's hair splitting, but, isn't 8bit 256 out of 16,777,216 ?
Depends. On the classic VGA cards it's 6:6:6 (6 bits red, 6 green, and 6
blue). On some SVGA cards these days it IS 8:8:8. But those are not very
common. :)
Anyway, the point I was making was that usually displaying a truecolor
(or millions if you're on a mac) image in 16bit hicolor (or thousands on
a mac) mode means that the the software simply drops off the least
significant color bits as 3:2:3. And that causes a lack of color
smoothness.
--min
> --
> Scott Hill
> Sco### [at] DDLinkscouk
> Software Engineer (and all round nice guy)
> Author of Pandora's Box
> Company homepage : http://www.ddlinks.demon.co.uk
>
> "The best trick the devil ever pulled was convincing people he didn't
> exist..."
> - Verbal Kint.
>
> "the Internet is here so we can waste time talking about nothing in
> particular when we should be working" - Marcus Hill.
--
Lewis A. Sellers: writer and contract Multimedia Website Developer
mailto:lse### [at] usitnet (The Fourth Millennium Foundation)
http://www.public.usit.net/lsellers/ & http://www.fourthfoundation.com
http://brain-of-pooh.tech-soft.com/users/critters/bios/sellers_lewis.html
You can bug the living bejesus out of me live on ICQ @ 491461
(If I don't get back to you within a month, I'm out of prozac in some
dark corner somewhere screaming things quite unintelligable but -- most
curiously -- thick with a sumerian accent.)
"The comedy is over" -i pagliacci
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The wierd thing is that even when I set it to 640x480 24bit (the max), I
still see the "bands" on everyones images.
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Im Beitrag <361AA54C.7D163D36@usit.net> , Lewis Sellers <lse### [at] usitnet> schrieb:
>Anyway, the point I was making was that usually displaying a truecolor
>(or millions if you're on a mac) image in 16bit hicolor (or thousands on
>a mac) mode means that the the software simply drops off the least
>significant color bits as 3:2:3. And that causes a lack of color
>smoothness.
Just a sidenote: The Mac 3.1 version has *full* dithering in whatever resolution you
run it. And we can even view the alpha-channel - it works just the way Photoshop does
it :-)
Thorsten
____________________________________________________
Thorsten Froehlich, Duisburg, Germany
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Sirrus wrote:
>
> The wierd thing is that even when I set it to 640x480 24bit (the max), I
> still see the "bands" on everyones images.
Hmm....
Do the bands occur only with povray images? when looking at it with
povray or with other programs like acdsee or paint shop?
Maybe your card is physically loose from it's slot? :)
--
Lewis A. Sellers: writer and contract Multimedia Website Developer
mailto:lse### [at] usitnet (The Fourth Millennium Foundation)
http://www.public.usit.net/lsellers/ & http://www.fourthfoundation.com
http://brain-of-pooh.tech-soft.com/users/critters/bios/sellers_lewis.html
You can bug the living bejesus out of me live on ICQ @ 491461
(If I don't get back to you within a month, I'm out of prozac in some
dark corner somewhere screaming things quite unintelligable but -- most
curiously -- thick with a sumerian accent.)
"The comedy is over" -i pagliacci
Post a reply to this message
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