Re: Defishing the Zenitar
On Wed, Aug 24, 2005 at 01:26:26PM -0700, Powell Hargrave wrote: > >> Try the PTLens. Newest version has customisable defishing function > >There's one for gimp? Where? > Not PTLens, but looks like 'clens' uses PTLens profiles. > http://epaperpress.com/ptlens/index.html Good. I'll try it, and compare it to wideangle filter in Gimp. I have some test shoots with Zenitar, made with 35mm camera ofcourse, and scanned. -- [EMAIL PROTECTED], IRC:[EMAIL PROTECTED], /bin/zsh. C|N>K Linux moria 2.6.11 #1 Wed Mar 9 19:08:59 CET 2005 i686 10:59:38 up 29 days, 3:32, 4 users, load average: 0.62, 1.10, 0.92 Cuj... instaliraj picku i evo mene do tebe. (c) Zoltan '96
Re: Defishing the Zenitar
>> Try the PTLens. Newest version has customisable defishing function > >There's one for gimp? Where? Not PTLens, but looks like 'clens' uses PTLens profiles. http://epaperpress.com/ptlens/index.html Powell
Re: Defishing the Zenitar
On Wed, Aug 24, 2005 at 05:56:58PM +0200, Frantisek wrote: > VS> I also have a Zenitar, and did some experiments with wideangle filter in > VS> Gimp. Results were not perfect, but not so bad even. > Try the PTLens. Newest version has customisable defishing function (as There's one for gimp? Where? > well as chromatic aberration control), and it also has a profile > exactly for the Zenitar on 1.5x crop cameras. Works quite well from > when I tried it on some sample fisheye photos. Hm, but I don't own any DSLR yet :( -- [EMAIL PROTECTED], IRC:[EMAIL PROTECTED], /bin/zsh. C|N>K Linux moria 2.6.11 #1 Wed Mar 9 19:08:59 CET 2005 i686 19:09:22 up 28 days, 11:42, 4 users, load average: 0.26, 0.26, 0.20 "The mistakes are all waiting to be made." - chessmaster Savielly Grigorievitch Tartakower (1887-1956) on the game's opening position [George...]
Re: Defishing the Zenitar
PTLens is free. It has a Zenitar 16mm lens profile. There are versions for other operating systems. http://epaperpress.com/ptlens/index.html PTLens is a front end for Panorama Tools, also free. The actions could be made to run using just Panorama Tools but they run smoother with PTlens. I may modify them for Panorama Tools so they would be Mac compatible. The only problem with the PTLens correction is that it chops a fair chunk off of the sides of the image. The whole point of this lens is to get wide and PTLens correction makes it narrower. Examples: http://members.shaw.ca/hargravep/Image8.htm Powell >VS> I also have a Zenitar, and did some experiments with wideangle filter in >VS> Gimp. Results were not perfect, but not so bad even. > >Try the PTLens. Newest version has customisable defishing function (as >well as chromatic aberration control), and it also has a profile >exactly for the Zenitar on 1.5x crop cameras. Works quite well from >when I tried it on some sample fisheye photos. >Good light! > fra >
Re: Defishing the Zenitar
Web page now up with some examples: http://members.shaw.ca/hargravep/Image8.htm Powell
Re: Defishing the Zenitar
VS> I also have a Zenitar, and did some experiments with wideangle filter in VS> Gimp. Results were not perfect, but not so bad even. Try the PTLens. Newest version has customisable defishing function (as well as chromatic aberration control), and it also has a profile exactly for the Zenitar on 1.5x crop cameras. Works quite well from when I tried it on some sample fisheye photos. Good light! fra
Re: Defishing the Zenitar
On Tue, Aug 23, 2005 at 11:46:00PM -0700, Powell Hargrave wrote: [...] > If you have the Zenitar 16mm, an ist D/Ds, PhotoShop and Windows please > give these actions a try. Contact me and I will send the actions and > instructions. I plan on putting up a web page but I would like to get some > feedback first. Can you give some examples? I also have a Zenitar, and did some experiments with wideangle filter in Gimp. Results were not perfect, but not so bad even. -- [EMAIL PROTECTED], IRC:[EMAIL PROTECTED], /bin/zsh. C|N>K Linux moria 2.6.11 #1 Wed Mar 9 19:08:59 CET 2005 i686 10:12:35 up 28 days, 2:45, 4 users, load average: 0.20, 0.28, 0.27 A daj, i ja sam skoro pa starac... (c) Vid -> Krba '98
Defishing the Zenitar
I have developed three PhotoShop actions to make rectilinear images from the Zenitar 16mm fisheye when used on the ist D/Ds. The actions require Panorama Tools and PTLens, both free downloads. PTLens is a Windows program. The actions use PTLens to defish the image. PTLens correction for the Zenitar simply chops off the extra image size which converting to rectilinear creates. The first action 'Zenitar Defish' expands the canvas to the correct size to retain the extra image size which is created defishing the Zenitar image. 'Zenitar Spherize' Uses PhotoShop's Spherize tool to squeeze the image back into the original frame size. Works well with distant objects, verticals and horizontals but messes up if there is a diagonal close to the camera. 'Modified Zenitar Spherize' will make some images with close diagonals better. I created a modified PTLens Zenitar lens profile to over correct the fisheye distortion. Compressing the image back to the original frame size with Spherize straitens the diagonals. PTLens must be pre loaded with the correct lens profile before running each actions. This is a pain and I wish there was a way around it. I think the two actions work well but will not give perfectly straight lines in all images. If you have the Zenitar 16mm, an ist D/Ds, PhotoShop and Windows please give these actions a try. Contact me and I will send the actions and instructions. I plan on putting up a web page but I would like to get some feedback first. The actions should also work with the Pentax or Sigma 15mm fisheyes. Powell
