Re: [Gimp-user] R: Need tutorials and other information about ufraw
On Wed, 2011-07-27 at 08:34 +0400, Alexandre Prokoudine wrote: On Wed, Jul 27, 2011 at 8:28 AM, Leonard Evens wrote: I haven't looked in detail, but I wasn't able to find any color management in darktable. But it's there :) You can select camera profiles (1), display profile (2) and destination profile (3). (1) and (2) are available in darkroom mode (right sidebar), and (3) is in exporting plug-in. Thank you. I haven't actually tried it yet, but I did start reading the User's Guide. I searched the Guide for relevant words having to do with color management, and I didn't find anything. I was hoping the videos at the website would be helpful, but they didn't run properly for me. I found a video at Youtube, but it wasn't too helpful. Alexandre Prokoudine http://libregraphicsworld.org ___ Gimp-user mailing list Gimp-user@lists.XCF.Berkeley.EDU https://lists.XCF.Berkeley.EDU/mailman/listinfo/gimp-user ___ Gimp-user mailing list Gimp-user@lists.XCF.Berkeley.EDU https://lists.XCF.Berkeley.EDU/mailman/listinfo/gimp-user
Re: [Gimp-user] R: Need tutorials and other information about ufraw
On Tue, 2011-07-26 at 22:59 +0100, Stefano Rovetta wrote: I can do the lens correction with ufraw manually, but there are three parameters, and it is hard to figure out how to adjust them visually. After a very quick googling I landed here: http://wiki.panotools.org/Lens_correction_model As far as I can understand, this is the model used by UFRaw. You might calibrate the parameters for each of your lenses with the aid of the model and some reference image (e.g. you can print a grid on paper and take a photo with your lenses, setting the zooms at significant positions like max wide/max tele/center). Then you can guess the parameters by analyzing the correction formula, or you can even write a distortion measure and minimize it analytically - I am sure you have the necessary background to do that, and it can even be fun to do it. Actually, I am familiar with the lens model, and at one point I tried to calculate the coefficients for a lens I had. It is not conceptually difficult, but it is harder in practice to do than one might imagine. I would rather not do it if it has already been done. As I remarked, the gimplensfun filter does a very good job based on what it finds in the exif file, and it works very well for my 18-200 mm Nikkor lens. So ufraw should be able to do as well. I think it is bug in ufraw and I hope someone will fix it soon. ___ Gimp-user mailing list Gimp-user@lists.XCF.Berkeley.EDU https://lists.XCF.Berkeley.EDU/mailman/listinfo/gimp-user -- Leonard Evens l...@math.northwestern.edu Professor Emeritus, Department of Mathematics, Northwestern University ___ Gimp-user mailing list Gimp-user@lists.XCF.Berkeley.EDU https://lists.XCF.Berkeley.EDU/mailman/listinfo/gimp-user
Re: [Gimp-user] R: Need tutorials and other information about ufraw
On Wed, Jul 27, 2011 at 2:28 AM, Leonard Evens wrote: Actually, I am familiar with the lens model, and at one point I tried to calculate the coefficients for a lens I had. It is not conceptually difficult, but it is harder in practice to do than one might imagine. I would rather not do it if it has already been done. As I remarked, the gimplensfun filter does a very good job based on what it finds in the exif file, and it works very well for my 18-200 mm Nikkor lens. So ufraw should be able to do as well. I think it is bug in ufraw and I hope someone will fix it soon. If you are on Linux, I'd rather recommend darktable over UFRaw. It also supports LensFun library to fix distorsions. Meanwhile Hugin 2011.2.0 is coming with lens calibration UI (just in case you're interested). Alexandre Prokoudine http://libregraphicsworld.org ___ Gimp-user mailing list Gimp-user@lists.XCF.Berkeley.EDU https://lists.XCF.Berkeley.EDU/mailman/listinfo/gimp-user
Re: [Gimp-user] R: Need tutorials and other information about ufraw
On Wed, 2011-07-27 at 02:56 +0400, Alexandre Prokoudine wrote: On Wed, Jul 27, 2011 at 2:28 AM, Leonard Evens wrote: Actually, I am familiar with the lens model, and at one point I tried to calculate the coefficients for a lens I had. It is not conceptually difficult, but it is harder in practice to do than one might imagine. I would rather not do it if it has already been done. As I remarked, the gimplensfun filter does a very good job based on what it finds in the exif file, and it works very well for my 18-200 mm Nikkor lens. So ufraw should be able to do as well. I think it is bug in ufraw and I hope someone will fix it soon. If you are on Linux, I'd rather recommend darktable over UFRaw. It also supports LensFun library to fix distorsions. I've installed darktable, but I had a lot of trouble running the videos which were promised. I guess I will use the manual. Is darktable supposed to substitute for gimp altogether? Meanwhile Hugin 2011.2.0 is coming with lens calibration UI (just in case you're interested). I am interested. I've used hugin to create panoramas with my view camera. I make two or three exposures on color negative film using a panoramic head, scan them and then combine them with hugin. It allowed me to take a picture of a building facade from relatively close up with my 75 mm (roughly equivalent to 18-23 mm in 35 mm) lens which I couldn't possibly do in one exposure. Of course with a view camera lens, the lens distortion is so small that it is not usually worth worrying about. The problem with hugin is that the learning curve is pretty steep, and I don't use it often enough to remember how to use it. Alexandre Prokoudine http://libregraphicsworld.org ___ Gimp-user mailing list Gimp-user@lists.XCF.Berkeley.EDU https://lists.XCF.Berkeley.EDU/mailman/listinfo/gimp-user ___ Gimp-user mailing list Gimp-user@lists.XCF.Berkeley.EDU https://lists.XCF.Berkeley.EDU/mailman/listinfo/gimp-user
Re: [Gimp-user] R: Need tutorials and other information about ufraw
On Wed, Jul 27, 2011 at 4:00 AM, Leonard Evens wrote: Is darktable supposed to substitute for gimp altogether? Not at all. The do have some overlaps feature-wise, which is why the long-term goal is to make them compatible. Darktable focuses on workflow and global editing, while GIMP has better localized editing tools. The problem with hugin is that the learning curve is pretty steep, and I don't use it often enough to remember how to use it. It's somewhat intentional :) Alexandre Prokoudine http://libregraphicsworld.org ___ Gimp-user mailing list Gimp-user@lists.XCF.Berkeley.EDU https://lists.XCF.Berkeley.EDU/mailman/listinfo/gimp-user
Re: [Gimp-user] R: Need tutorials and other information about ufraw
On Wed, 2011-07-27 at 04:29 +0400, Alexandre Prokoudine wrote: On Wed, Jul 27, 2011 at 4:00 AM, Leonard Evens wrote: Is darktable supposed to substitute for gimp altogether? Not at all. The do have some overlaps feature-wise, which is why the long-term goal is to make them compatible. Darktable focuses on workflow and global editing, while GIMP has better localized editing tools. I haven't looked in detail, but I wasn't able to find any color management in darktable. I want my photoediting tools to at least take account of my display profile. Apparently, ufraw does do so through use of the system display profile. The problem with hugin is that the learning curve is pretty steep, and I don't use it often enough to remember how to use it. It's somewhat intentional :) Alexandre Prokoudine http://libregraphicsworld.org ___ Gimp-user mailing list Gimp-user@lists.XCF.Berkeley.EDU https://lists.XCF.Berkeley.EDU/mailman/listinfo/gimp-user ___ Gimp-user mailing list Gimp-user@lists.XCF.Berkeley.EDU https://lists.XCF.Berkeley.EDU/mailman/listinfo/gimp-user
Re: [Gimp-user] R: Need tutorials and other information about ufraw
On Wed, Jul 27, 2011 at 8:28 AM, Leonard Evens wrote: I haven't looked in detail, but I wasn't able to find any color management in darktable. But it's there :) You can select camera profiles (1), display profile (2) and destination profile (3). (1) and (2) are available in darkroom mode (right sidebar), and (3) is in exporting plug-in. Alexandre Prokoudine http://libregraphicsworld.org ___ Gimp-user mailing list Gimp-user@lists.XCF.Berkeley.EDU https://lists.XCF.Berkeley.EDU/mailman/listinfo/gimp-user
