Re: [Gimp-user] how to correct optical distortions of wide-anglelenses?
John Aughey wrote: > > On Thu, 24 Jan 2002, Peter Buckenleib wrote: > > is there a way to correct optical distortions of wide-angle lenses ( most > > annoing within architectural pics ) using gimp ? > > It sounds like you want something that you don't have to create yourself. > That doesn't exist, Yes it does. Check out: http://members.ozemail.com.au/~hodsond/wideangle.html -- David Hodson -- this night wounds time ___ Gimp-user mailing list [EMAIL PROTECTED] http://lists.xcf.berkeley.edu/mailman/listinfo/gimp-user
Re: [Gimp-user] how to correct optical distortions of wide-anglelenses?
On Thu, 24 Jan 2002, Peter Buckenleib wrote: > is there a way to correct optical distortions of wide-angle lenses ( most > annoing within architectural pics ) using gimp ? It's possible...read on. > I'm dreaming of something like stetching the upper side, interpolate all the > pixel-lines down to the bottom-line (which remains unstretched) and then > cutting away the resulting triangles on the left and right side to restore > the original size of the scan. What you need to do is first calibrate the camera. By that, I mean you need to be able to determine the optical distortion parameters of the lens. This includes, the center of optical distortion (usually not exactally in the center), and the spherical distortion exhibited by the lens. There's software out there to do this and I've done it with my own digital video camera for CGI. It sounds like you want something that you don't have to create yourself. That doesn't exist, but if you are interested in doing some programming I can point you to some sources. You might be able to use some of the lens effects already in gimp and guess at some numbers, but your mileage may vary. John ___ Gimp-user mailing list [EMAIL PROTECTED] http://lists.xcf.berkeley.edu/mailman/listinfo/gimp-user
Re: [Gimp-user] how to correct optical distortions of wide-anglelenses?
On Thu, 24 Jan 2002, Peter Buckenleib wrote: > is there a way to correct optical distortions of wide-angle lenses ( most > annoing within architectural pics ) using gimp ? Peter, That's an interesting idea. Have you thought of doing the correction as you take the photograph? If you keep the film plane parallel to the front of the building you won't have the distortion. Without a full, tilt-and-swing bellows arangement on your camera, you can do it by choosing the proper lens and shooting position. Of course, sometimes you just cannot get to the right position. :-) Good luck! Rich Dr. Richard B. Shepard, President Applied Ecosystem Services, Inc. (TM) 2404 SW 22nd Street | Troutdale, OR 97060-1247 | U.S.A. + 1 503-667-4517 (voice) | + 1 503-667-8863 (fax) | [EMAIL PROTECTED] http://www.appl-ecosys.com ___ Gimp-user mailing list [EMAIL PROTECTED] http://lists.xcf.berkeley.edu/mailman/listinfo/gimp-user
