Hi Robert, Thank you, for your reply. i am tring some other method now (integrating image processing alogothms in my code) i hope this will help me. thanks again for suggesting me the third party implementations. regards,K.Kiruba.
--- On Wed, 8/5/09, Robert Osfield <[email protected]> wrote: From: Robert Osfield <[email protected]> Subject: Re: [osg-users] Blending Low Resolution Texture to Big Screen To: "OpenSceneGraph Users" <[email protected]> Date: Wednesday, August 5, 2009, 12:56 PM Hi Kiruba, Your problem is unreasonable expectations. Mip mapping is purely for minification and won't help you when you magnify. What you should expect is heavily un-sampled textures to look lousy, this is normal. The fix is to sample your textures correctly so they aren't heavily undersampled. Robert. On Fri, Jul 31, 2009 at 8:08 AM, kiruba nantham<[email protected]> wrote: > Hi Robert, > Yes i understand i am trying to do somthing that beyond OSG support. i > have already done these teture mappings but i have never tried these > mipmapping techniques. even now i am able mipmap it but my big problem here > as you said undersampling. i checked with CImg Library (3rd party) > applications but i am unable to integrate it in my application. please can > you explain if you have any idea? > regards, > kiruba. > --- On Mon, 7/27/09, Robert Osfield <[email protected]> wrote: > > From: Robert Osfield <[email protected]> > Subject: Re: [osg-users] Blending Low Resolution Texture to Big Screen > To: "OpenSceneGraph Users" <[email protected]> > Date: Monday, July 27, 2009, 3:46 PM > > Hi Kurba, > > I'm Ulrich, this is classic undersampling, the best way to solve it is > to choose you texture resolution far more appropriately, you certainly > can't expect good results with such an aggressive undersampling, > OpenGL certainly won't help you, and the OSG does have any magical > pixie dust to help you either. > > If you really really must try and use such an undersampled image then > go have a look at 3rd party tools for image processing to see if they > can provide edge detection and filtering based on this, or some other > specific method to handling such extreme undersampling. > > Robert. > > On Mon, Jul 27, 2009 at 11:08 AM, kiruba > nantham<[email protected]> wrote: >> Hi Hertlein, >> Thank you for your reply, >> Yes, i accept as you said i am blowing each pixel in the texture to 8x >> its size. but what all i want is after making this image bigger (i.e. 8x) >> just adding some blur to overall picture so that the edges dostn't look >> odd. >> the problem here is i don't know how to add blur in OSG. if you can give >> some tutorial links i can look in to it. >> Regards, >> Kiruba. >> >> --- On Mon, 7/27/09, Ulrich Hertlein <[email protected]> wrote: >> >> From: Ulrich Hertlein <[email protected]> >> Subject: Re: [osg-users] Blending Low Resolution Texture to Big Screen >> To: "OpenSceneGraph Users" <[email protected]> >> Date: Monday, July 27, 2009, 3:01 PM >> >> On 27/07/09 10:48 AM, kiruba nantham wrote: >>> Hi friends, I am new to OSG. i am trying to map my small texture >>> (128*128 pixel) to >>> Big display (800*800 pixel). i am able to load successfully but i face >>> one >>> problem with >>> it. the problem is my picture doesn't like smooth, my image looks very >>> bad >>> (picture is >>> attached with this mail). can any one suggest any way to make my picture >>> look proper? >> >> Increase the resolution. >> >> There is simply not enough information in a 128x128 image to make it look >> nice at the output resolution. Remember that your blowing up each pixel >> in >> the texture to 8x its size. >> >> Cheers, >> /ulrich >> _______________________________________________ >> 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 >> >> > _______________________________________________ > 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 > > _______________________________________________ osg-users mailing list [email protected] http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
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