I've found that RGB-16 solves my issues, but not RGBA
On Thu, Sep 26, 2013 at 6:39 PM, Brad Colbert <[email protected]> wrote: > Hi Robert, > > Maybe I'm using the wrong switch? From my email below "the target has > compression disabled using -RGBA." > > Does this need to be specified after each -layer # switch? > > -B > > > > From: [email protected] [mailto: > [email protected]] On Behalf Of Robert Osfield > Sent: Thursday, September 26, 2013 11:27 AM > To: OpenSceneGraph Users > Subject: Re: [osg-users] VPB adding noise to imagery > > 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. > > > > > > > -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 > > _______________________________________________ > osg-users mailing list > [email protected] > http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org >
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