HI Brad, My guess is that it's an artefact of using OpenGL/ST3C compression that the OSG uses by default to keep the tile sizes. You can disable compression when doing the VPB build by choosing an RGB output format. Run osgdem --help to see all the options.
Robert. On 26 September 2013 17:39, Brad Colbert <[email protected]> wrote: > Hi folks,**** > > ** ** > > We are building a database using an additional texture layer as a height > field. I'm finding that the image stored in database is coming across with > what appears to be 1bit noise. A constant image of say, 125 / 255 after > going through VPB is coming out with some values of 124 / 255. The pattern > looks a bit like quantization noise but we are setting > --disable-error-diffusion just in case and the target has compression > disabled using -RGBA.**** > > ** ** > > Does anyone in OSG land have an idea where I can look to see what is > causing this?**** > > ** ** > > I'm attaching captured images where I've applied the same stretching > formula. One is from the rendering of the database and the other is from > Mathcad, where I loaded the source image and displayed it with the same > stretch. The database image capture shows the "speckles" where as the > source image does not.**** > > ** ** > > [image: Source.png]**** > > ** ** > > [image: Subset_VPB_pow10_1000.jpg]**** > > ** ** > > ** ** > > -B**** > > ** ** > > ---**** > > Brad Colbert**** > > Renaissance Sciences Corporation**** > > (480) 290-3997**** > > ** ** > > _______________________________________________ > osg-users mailing list > [email protected] > http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org > >
<<image001.jpg>>
<<image003.jpg>>
_______________________________________________ osg-users mailing list [email protected] http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
