Glenn Greenway wrote:
> 
> Thanks again for your input,
> 
> However, I've tried Photoshop and interpolate options to no avail.  Perhaps
> I'm missing something substantial but even my height fields look banded, as
> do my isosurfaces.  What I really want to do is sketch out my image map in
> Photoshop then use it do displace isosurfaces or height fields:
> unfortunately the rendered images show considerable banding.
> 
> Any other thoughts,
> 
> Glenn

A round about method :)

The HF program Leveller has some neat tools for working on 16 bit
greyscale images. Unfortunately it will only accept 24 bit .tga
images as input. You can convert your 8 bit grey to 24 bit tga,
import into Leveller, apply a wide variety of various filters to
it, and then export it to 16 bit grey for your final work. A bit
of a round trip but possible.

Leveller - http://www.daylongraphics.com/

-- 
Ken Tyler - 1400+ POV-Ray, Graphics, 3D Rendering, and Raytracing Links:
http://home.pacbell.net/tylereng/index.html http://www.povray.org/links/

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Glenn Greenway wrote in message ...
>
>Thanks again for your input,
>
>However, I've tried Photoshop and interpolate options to no avail.  Perhaps
>I'm missing something substantial but even my height fields look banded, as
>do my isosurfaces.  What I really want to do is sketch out my image map in
>Photoshop then use it do displace isosurfaces or height fields:
>unfortunately the rendered images show considerable banding.


HFLab (or whatever it is called now) can work with 16 bit PNG and TGA
images.  It is available for DOS and (i think) Linux and Windows.

Mark

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On Sat, 08 Jul 2000 23:09:35 -0500, Mark Gordon wrote...
> > As far as smoothing greyscale bitmaps goes, do you have access to
> > Photoshop or Paint Shop Pro, or the GIMP?  Any of those should be able to
> > apply a gaussian blur to the images and save the resulting image out with
> > a greater bit depth.
> 
> Be forewarned: I don't think the standard current version of the GIMP
> supports 16-bit greyscale.  There is a 16-bit version of the GIMP (i.e.
> 16 bits for each of red, green, blue, alpha) being developed for the
> film industry (with some subsidy), since they're the ones chiefly
> interested in that sort of color depth at this point.  Eventually that
> functionality will be merged back into the main branch of GIMP
> development.  The 16-bit version is referred to as Hollywood GIMP.  It's
> home page is http://film.gimp.org/index.html.  I haven't had a chance to
> play with it yet, but I did some looking into this at a time when I
> wanted a 16-bit heightfield.

Ah. Right.

I wasn't aware of that, since I don't use *nix.  That's another useless 
fact to file away for a rainy day then :)

Bye for now,
     Jamie.

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Mark Wagner wrote:
> 
> Glenn Greenway wrote in message ...
> >
> >Thanks again for your input,
> >
> >However, I've tried Photoshop and interpolate options to no avail.  Perhaps
> >I'm missing something substantial but even my height fields look banded, as
> >do my isosurfaces.  What I really want to do is sketch out my image map in
> >Photoshop then use it do displace isosurfaces or height fields:
> >unfortunately the rendered images show considerable banding.
> 
> HFLab (or whatever it is called now) can work with 16 bit PNG and TGA
> images.  It is available for DOS and (i think) Linux and Windows.
> 
> Mark

I know it's available in source code form.
It does just about any filter operations you could think of and works in
floating point internally.
Available from http://www.best.com/~beale/

PoD.

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In article <39677C87.231BD1F9@online.no> , Tor Olav Kristensen 
<tor### [at] onlineno>  wrote:

> Are you really sure about this ?

Yes, except someone starts picking on my words :-)

I think what I wrote is understandable for everyone who wants to.  It is
common to refer to the collection of pixels on a display controlled by a
computer as "computer screen", so please don't put words in my e-mail that I
didn't write.

I am not interested in continuing the discussion about my wording, so no
more off-topic posts needed in this thread.


    Thorsten


PS: I am not offended and do not intend to offend you.

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Greetings.

        Forgive me for butting in to this discussion, but I have
written a .pov "script" that I have used for reading in 8-bit
greyscale images and outputting a smoothed (blurred) 16-bit
image.
        I have posted the .pov source code in
povray.text.scene-files.
        I hope this helps.

Peter

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Pete wrote:
> 
> Greetings.
> 
>         Forgive me for butting in to this discussion, but I have
> written a .pov "script" that I have used for reading in 8-bit
> greyscale images and outputting a smoothed (blurred) 16-bit
> image.
>         I have posted the .pov source code in
> povray.text.scene-files.
>         I hope this helps.
> 
> Peter

Thinking about your code I just wondered, why Povray generates red/green 16 Bit
TGA Files with +ft but 8 Bit PNG files with +fn in hf_gray_16 mode (you have to
use +fn16 to get 16 Bit PNG)
 
Christoph

--
Christoph Hormann <chr### [at] gmxde>
Homepage: http://www.schunter.etc.tu-bs.de/~chris/

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