jez Posted January 23, 2005 Share Posted January 23, 2005 I use a Nikon Coolpix 3500 for my digital work. It's a great little camera, but on its shortest focal length produces wide angle distortion. OK when wanted, but you can't tell on the LCD display that it's going to happen. With archiecture shots I need to find a way of removing this distortion. Photoshop has Sherize Distortion filter which can be set negative, but it only works at the centre of the picture. Does anyone know of any other filters or techniques to straighten things out? Link to comment Share on other sites More sharing options...
mikep Posted January 23, 2005 Share Posted January 23, 2005 select all, edit, transform, skew. Link to comment Share on other sites More sharing options...
ronald_moravec1 Posted January 23, 2005 Share Posted January 23, 2005 Define wide angle distortion. If it is the skewing effect from tilting the camera, that is one thing. If it is the barrel to picushon distortion from a zoom lens, there are programs that correct that. If it is the eliptical shape of circular objects toward the corners of the frame, I don`t think it can be corrected except if you stitch a panorama together. Link to comment Share on other sites More sharing options...
joe_hunt1 Posted January 23, 2005 Share Posted January 23, 2005 From Distort - Spherize, you then have Mode - Normal (default) which is the centre only one, and two other options - Horizontal only, Vertical only. If you select Horizontal and do the degree of correction appropriate for that axis, then Vertical and do likewise for that axis, the adjustment diagram shows adjustable correction graduated across the full image area. Link to comment Share on other sites More sharing options...
joe_hunt1 Posted January 23, 2005 Share Posted January 23, 2005 Having just tried my own remedy I'm not sure I can recommend it after all. Link to comment Share on other sites More sharing options...
digitmstr Posted January 23, 2005 Share Posted January 23, 2005 I thought double posts got deleted? Link to comment Share on other sites More sharing options...
tom_swanson Posted January 23, 2005 Share Posted January 23, 2005 Hunt down PTLens. It is free and works great. Link to comment Share on other sites More sharing options...
elliot_n Posted January 23, 2005 Share Posted January 23, 2005 Double the Canvas Size in Photoshop - then the Spherize filter will do what you want. Link to comment Share on other sites More sharing options...
denisgermain Posted January 24, 2005 Share Posted January 24, 2005 Don't just eyeball it... use PTlens http://www.epaperpress.com/ptlens/index.html Link to comment Share on other sites More sharing options...
jez Posted January 24, 2005 Author Share Posted January 24, 2005 I can't get this program to work - it wants to know the make and model of my camera, but then has no Profile for it - a Nikon 3500 digital -so it won't adjust. Any thoughts? Link to comment Share on other sites More sharing options...
robert goldstein Posted January 24, 2005 Share Posted January 24, 2005 Another method is to crop with the perspective box checked. This allows you to move both corners of one edge of the image inward an appropriate distance so as to make converging lines parallel. Doing this too aggressively can cause some of the subject matter appear very squat. Link to comment Share on other sites More sharing options...
wakeforce Posted January 24, 2005 Share Posted January 24, 2005 If it doesn't have a profile for it, you can send a sample to the maker of PTLens and he will create the profile you need. Instructions to do so are written on his website. Link to comment Share on other sites More sharing options...
jez Posted January 25, 2005 Author Share Posted January 25, 2005 Thanks for all the helpful suggestions. The question is not one of Perspective - I can and do use the Transform-Skew tool in Photoshop to adjust for parallax. But neither Transform nor Crop adjusts for the curvature caused by barrel distortion. I will try emailing the PTLens people, but I'm surprised that there isn't a readilly available filter/tool for this adjustment that doesn't rely on a lens specification. Link to comment Share on other sites More sharing options...
john_houghton Posted January 25, 2005 Share Posted January 25, 2005 Maybe Flo's Undistort plugin is what you are looking for: free from http://flofilters.free.fr/ . There's also the LensDoc plugin from http://www.andromeda.com. John Link to comment Share on other sites More sharing options...
jez Posted January 25, 2005 Author Share Posted January 25, 2005 John - Thanks, I downloaded the Flofilters plugin and it is exactly the tool I need and it really works well. Thanks again for taking the trouble to point me in the right direction. No more barrels - yipee!<div></div> Link to comment Share on other sites More sharing options...
tom_swanson Posted January 25, 2005 Share Posted January 25, 2005 Panorama Tools (Which PTLens is, I believe, based on.) would have let you do this, too. Link to comment Share on other sites More sharing options...
jez Posted January 26, 2005 Author Share Posted January 26, 2005 But PTLens is $98 and FloFilter's Undistort is E15 or $20, and I'm a cheapskate! Link to comment Share on other sites More sharing options...
john_houghton Posted January 26, 2005 Share Posted January 26, 2005 Marlin, Where did you get the idea that PTLens is $98? The plugin and standalone versions are both free. John Link to comment Share on other sites More sharing options...
jez Posted January 27, 2005 Author Share Posted January 27, 2005 John, sorry I got confused between products. It's LensDoc from Andromeda (referred to in a post further up the thread) that's $98. PTLens is free, but the only way I could see of getting it to work was to upload a profile file for my lens - but I can't find one for the Nikkon Coolpix 3500. Link to comment Share on other sites More sharing options...
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