R: Need tutorials and other information about ufraw
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R: Need tutorials and other information about ufraw
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.
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.
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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
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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
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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
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
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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
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
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Problem exporting files.
I am running gimp 2.8.4 under Fedora 17 Linux. When I try to export a file I've worked on, gimp crashes. The exported file is written, but I have to restart gimp to continue working.
What is going on?
Leonard Evens len@math.northwestern.edu Professor Emeritus, Department of Mathematics, Northwestern University
How do I save and then restore tool options.
I am having trouble recovering the tool options I set. This could be the result of the fact that I've been exporting images, and, when I do, gimp crashes. So it could be that although I try to save the options, they are not actually saved because of the crash.
Leonard Evens len@math.northwestern.edu Professor Emeritus, Department of Mathematics, Northwestern University
Problem exporting files.
I am running gimp 2.8.4 under Fedora 17 Linux. When I try to export a file I've worked on, gimp crashes. The exported file is written, but I
have to restart gimp to continue working.What is going on?
Try starting gimp from the command line, cause a crash and see what the console then says, might give some clues
Owen
How do I save and then restore tool options.
Hi Leonard,
thank you for reporting this. Depending on exactly where the program crashes, losing your tool options can surely be a side effect of a crash. If you have a set of default options you use quite often, you can keep them. Open Edit/Preferences/Tool Options and press the 'Save tool options now' button.
Without having more information about the file and your configuration it is hard to give you a detailed answer. It would be good, if you could report this on Bugzilla and attach the file there (preferably the XCF file, if you have one). We could try to reproduce it then. Is this probably the same as bug #683983 [1]? If yes, please add your findings there. Otherwise file a new bug report, please.
Kind regards,
Sven
How do I save and then restore tool options.
On Sat, 2013-04-20 at 08:07 +0200, scl wrote:
Hi Leonard,
thank you for reporting this. Depending on exactly where the program crashes, losing your tool options can surely be a side effect of a crash. If you have a set of default options you use quite often, you can keep them. Open Edit/Preferences/Tool Options and press the 'Save tool options now' button.
I did what you suggest and the p references were in fact saved. It is a bit confusing because the icon is the same as that in the tool itslef for saving the preferences, but that didn't work. But I also checked the vox for saving the preferences on exit, which was unchecked, and that might have made a difference.
Without having more information about the file and your configuration it is hard to give you a detailed answer. It would be good, if you could report this on Bugzilla and attach the file there (preferably the XCF file, if you have one). We could try to reproduce it then. Is this probably the same as bug #683983 [1]? If yes, please add your findings there. Otherwise file a new bug report, please.
My crashing on exports seems to be exactly what the bug report describes. I have to study the bug report to see if it suggests a solution I can use.
I will do something about the bug one way or the other. I've reported it in this users group already. It happens on every file I export. I've tried both exporting as tiff and as png.
Kind regards,
Sven
[1] https://bugzilla.gnome.org/show_bug.cgi?id=683983
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Leonard Evens len@math.northwestern.edu Professor Emeritus, Department of Mathematics, Northwestern University
Problem exporting files.
On Sat, 2013-04-20 at 15:37 +1000, Owen wrote:
I am running gimp 2.8.4 under Fedora 17 Linux. When I try to export a file I've worked on, gimp crashes. The exported file is written, but I
have to restart gimp to continue working.What is going on?
Try starting gimp from the command line, cause a crash and see what the console then says, might give some clues
I've been referred to bug
https://bugzilla.gnome.org/show_bug.cgi?id=683983
which seems to be what I see happening.
I will have to study the bugzilla comments to see if they provide a solution.
Leonard Evens len@math.northwestern.edu Professor Emeritus, Department of Mathematics, Northwestern University
