 |
|
|
|
|
|
| |
| |
|
|
|
|
| |
| |
|
|
Hall wrote:
> using pov-ray 3.6.1 for windows on windows XP...
> Should I be seeing the banding produced in this minimal scene file?
> (Is this a limitation of POV's precision, or a bug? banding is
> stronger in original bmp of picture)
>
> camera { location <-4,4,-4> look_at <0,0,0> right <1,0,0> up <0,1,0> }
> light_source { <1,1,-1> color rgb 1 }
> plane { <0,1,0>, 0 pigment{color rgb 1} }
>
> and result....
What monitor do you have? Some old/cheap LCDs only do interpolated 18-bit
colour rather than true 24-bit. If it's quoted as being able to display
16.2 million colours, it's 18-bit, true 24-bit is 16.7 million colours. On
this pattern the interpolation your monitor is doing might be more visible.
Have you tried doing a gradient in another program, like powerpoint?
Post a reply to this message
|
|
| |
| |
|
|
|
|
| |
| |
|
|
Hall wrote:
> using pov-ray 3.6.1 for windows on windows XP...
> Should I be seeing the banding produced in this minimal scene file?
> (Is this a limitation of POV's precision, or a bug? banding is stronger in
> original bmp of picture)
Fredrick's got it right. The banding is natural for this kind of image
at 24-bit precision, as you effectively only have 8 bits of pure gray to
work with.
Outputting at 48 bits and then dithering down in another app (probably
GIMP or Photoshop) should help reduce the banding; it will also make
your image a bit grainy, but it shouldn't be visibly so. Alternately,
introducing more noise or color to the scene, or adding noise in
post-processing, should eliminate the banding.
-Xplo
Post a reply to this message
|
|
| |
| |
|
|
|
|
| |
| |
|
|
"scott" <sco### [at] spam com> wrote in message news:42edd2f4@news.povray.org...
> Hall wrote:
> > using pov-ray 3.6.1 for windows on windows XP...
> > Should I be seeing the banding produced in this minimal scene file?
> > (Is this a limitation of POV's precision, or a bug? banding is
> > stronger in original bmp of picture)
> >
> > camera { location <-4,4,-4> look_at <0,0,0> right <1,0,0> up <0,1,0> }
> > light_source { <1,1,-1> color rgb 1 }
> > plane { <0,1,0>, 0 pigment{color rgb 1} }
> >
> > and result....
>
> What monitor do you have? Some old/cheap LCDs only do interpolated 18-bit
> colour rather than true 24-bit. If it's quoted as being able to display
> 16.2 million colours, it's 18-bit, true 24-bit is 16.7 million colours.
On
> this pattern the interpolation your monitor is doing might be more
visible.
> Have you tried doing a gradient in another program, like powerpoint?
>
>
I see this banding on the two computers we have---both are using crt
monitors and are running in 32 bit (true color mode)....
In PSP when doing a pure gray gradient, the banding is also visible....but
when doing pure red or blue or green, the banding is not visible.
I agree, as was said by some others, this is a limitation of the 24 bit
nature of true color displays...will stick to using more color in pictures
from now on...if I ever get a system capable of 48 bit color display, then I
will try working with pure greyscale pictures again.
hexhall
Post a reply to this message
|
|
| |
| |
|
|
|
|
| |
| |
|
|
> I see this banding on the two computers we have---both are using crt
> monitors and are running in 32 bit (true color mode)....
> In PSP when doing a pure gray gradient, the banding is also
> visible....but when doing pure red or blue or green, the banding is
> not visible.
> I agree, as was said by some others, this is a limitation of the 24
> bit nature of true color displays...will stick to using more color in
> pictures from now on...if I ever get a system capable of 48 bit color
> display, then I will try working with pure greyscale pictures again.
You could turn the contrast down on your monitor :-)
Post a reply to this message
|
|
| |
| |
|
|
|
|
| |
|
|
