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Lens correction in darktable when my lens isn't known?
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I took some raw (CR2) photos with the Canon Powershot G5 X and want to edit them in darktable. The focal length is quite low and the distortion high. My Problem: I want to correct the distortion and don't know how.
The way I usually do this is by using darktable's lens correction module which automatically chooses the right values based on the exif information. It works for DSLRs but this camera/ isn't known.
If there is a way to correct it, I wouldn't know which values to choose.
The only hint I get is through the camera`s software which automatically saves a corrected preview jpeg roughly the same resolution embedded in the raw.
My question:
- What's the way to correct the distortion in darktable, if I cannot choose the right objective from the drop down menu in the lens correction module?
- How do I determine the values? Which values should I choose?
distortion darktable lens-correction
edited 2 hours ago
mattdm
117k37339630
asked 4 hours ago
quiliup
1084
New contributor
quiliup is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
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up vote
1
down vote
favorite
I took some raw (CR2) photos with the Canon Powershot G5 X and want to edit them in darktable. The focal length is quite low and the distortion high. My Problem: I want to correct the distortion and don't know how.
The way I usually do this is by using darktable's lens correction module which automatically chooses the right values based on the exif information. It works for DSLRs but this camera/ isn't known.
If there is a way to correct it, I wouldn't know which values to choose.
The only hint I get is through the camera`s software which automatically saves a corrected preview jpeg roughly the same resolution embedded in the raw.
My question:
- What's the way to correct the distortion in darktable, if I cannot choose the right objective from the drop down menu in the lens correction module?
- How do I determine the values? Which values should I choose?
distortion darktable lens-correction
edited 2 hours ago
mattdm
117k37339630
asked 4 hours ago
quiliup
1084
New contributor
quiliup is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
2
Related (ignoring the specific lens/body): Darktable doesn't recognize tamron 18-270mm lens
– scottbb
3 hours ago
Possible duplicate of Darktable doesn't recognize tamron 18-270mm lens
– Romeo Ninov
1 hour ago
add a comment |Â
up vote
1
down vote
favorite
up vote
1
down vote
favorite
I took some raw (CR2) photos with the Canon Powershot G5 X and want to edit them in darktable. The focal length is quite low and the distortion high. My Problem: I want to correct the distortion and don't know how.
The way I usually do this is by using darktable's lens correction module which automatically chooses the right values based on the exif information. It works for DSLRs but this camera/ isn't known.
If there is a way to correct it, I wouldn't know which values to choose.
The only hint I get is through the camera`s software which automatically saves a corrected preview jpeg roughly the same resolution embedded in the raw.
My question:
- What's the way to correct the distortion in darktable, if I cannot choose the right objective from the drop down menu in the lens correction module?
- How do I determine the values? Which values should I choose?
distortion darktable lens-correction
edited 2 hours ago
mattdm
117k37339630
asked 4 hours ago
quiliup
1084
New contributor
quiliup is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
I took some raw (CR2) photos with the Canon Powershot G5 X and want to edit them in darktable. The focal length is quite low and the distortion high. My Problem: I want to correct the distortion and don't know how.
The way I usually do this is by using darktable's lens correction module which automatically chooses the right values based on the exif information. It works for DSLRs but this camera/ isn't known.
If there is a way to correct it, I wouldn't know which values to choose.
The only hint I get is through the camera`s software which automatically saves a corrected preview jpeg roughly the same resolution embedded in the raw.
My question:
- What's the way to correct the distortion in darktable, if I cannot choose the right objective from the drop down menu in the lens correction module?
- How do I determine the values? Which values should I choose?
distortion darktable lens-correction
distortion darktable lens-correction
edited 2 hours ago
mattdm
117k37339630
asked 4 hours ago
quiliup
1084
New contributor
quiliup is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
edited 2 hours ago
mattdm
117k37339630
asked 4 hours ago
quiliup
1084
New contributor
quiliup is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
edited 2 hours ago
mattdm
117k37339630
edited 2 hours ago
mattdm
117k37339630
edited 2 hours ago
mattdm
117k37339630
117k37339630
asked 4 hours ago
quiliup
1084
New contributor
quiliup is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 4 hours ago
quiliup
1084
asked 4 hours ago
quiliup
1084
1084
New contributor
quiliup is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
New contributor
quiliup is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
quiliup is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
2
Related (ignoring the specific lens/body): Darktable doesn't recognize tamron 18-270mm lens
– scottbb
3 hours ago
Possible duplicate of Darktable doesn't recognize tamron 18-270mm lens
– Romeo Ninov
1 hour ago
add a comment |Â
2
Related (ignoring the specific lens/body): Darktable doesn't recognize tamron 18-270mm lens
– scottbb
3 hours ago
Possible duplicate of Darktable doesn't recognize tamron 18-270mm lens
– Romeo Ninov
1 hour ago
2
2
Related (ignoring the specific lens/body): Darktable doesn't recognize tamron 18-270mm lens
– scottbb
3 hours ago
Related (ignoring the specific lens/body): Darktable doesn't recognize tamron 18-270mm lens
– scottbb
3 hours ago
Possible duplicate of Darktable doesn't recognize tamron 18-270mm lens
– Romeo Ninov
1 hour ago
Possible duplicate of Darktable doesn't recognize tamron 18-270mm lens
– Romeo Ninov
1 hour ago
add a comment |Â
1 Answer
1
active
oldest
votes
up vote
3
down vote
accepted
Unfortunately, as of right now, darktable doesn't have a very good way of doing ad hoc distortion correction for a lens you don't have a lensfun profile for. The following is a dirty hack that may be useful in cases where the barrel distortion at the wide end of a zoom is so strong that even "incorrect" correction might be an improvement...
In the lens correction module, click on the top (camera) dropdown list, and manually select "Crop-factor 1.0 (Full Frame)" from the "Generic" menu category, then similarly for the lens dropdown select Generic>Rectilinear 10-1000mm f/1.0. Change the "geometry" setting to "fish-eye", and the "mode" setting to "distort". Now, when you change the value in the "mm" dropdown menu, you should get different degrees of generic "defishing"; start at the largest mm values and work down the list until you find something that looks closest to correct. Clicking the circular arrow button to the right of the "scale" slider will auto-adjust the scale to the largest crop with no blank pixels.
If you're trying to correct "pincushion" distortion at the long end of a zoom, change the mode to "correct" instead of "distort".
answered 3 hours ago
junkyardsparkle
4,325924
Good info. But I believe that lensfun 0.3.95 (development) has info for the G5 X, so perhaps just an update to 0.3.95 is all that's necessary?
– scottbb
1 hour ago
add a comment |Â
1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
up vote
3
down vote
accepted
Unfortunately, as of right now, darktable doesn't have a very good way of doing ad hoc distortion correction for a lens you don't have a lensfun profile for. The following is a dirty hack that may be useful in cases where the barrel distortion at the wide end of a zoom is so strong that even "incorrect" correction might be an improvement...
In the lens correction module, click on the top (camera) dropdown list, and manually select "Crop-factor 1.0 (Full Frame)" from the "Generic" menu category, then similarly for the lens dropdown select Generic>Rectilinear 10-1000mm f/1.0. Change the "geometry" setting to "fish-eye", and the "mode" setting to "distort". Now, when you change the value in the "mm" dropdown menu, you should get different degrees of generic "defishing"; start at the largest mm values and work down the list until you find something that looks closest to correct. Clicking the circular arrow button to the right of the "scale" slider will auto-adjust the scale to the largest crop with no blank pixels.
If you're trying to correct "pincushion" distortion at the long end of a zoom, change the mode to "correct" instead of "distort".
answered 3 hours ago
junkyardsparkle
4,325924
Good info. But I believe that lensfun 0.3.95 (development) has info for the G5 X, so perhaps just an update to 0.3.95 is all that's necessary?
– scottbb
1 hour ago
add a comment |Â
up vote
3
down vote
accepted
Unfortunately, as of right now, darktable doesn't have a very good way of doing ad hoc distortion correction for a lens you don't have a lensfun profile for. The following is a dirty hack that may be useful in cases where the barrel distortion at the wide end of a zoom is so strong that even "incorrect" correction might be an improvement...
In the lens correction module, click on the top (camera) dropdown list, and manually select "Crop-factor 1.0 (Full Frame)" from the "Generic" menu category, then similarly for the lens dropdown select Generic>Rectilinear 10-1000mm f/1.0. Change the "geometry" setting to "fish-eye", and the "mode" setting to "distort". Now, when you change the value in the "mm" dropdown menu, you should get different degrees of generic "defishing"; start at the largest mm values and work down the list until you find something that looks closest to correct. Clicking the circular arrow button to the right of the "scale" slider will auto-adjust the scale to the largest crop with no blank pixels.
If you're trying to correct "pincushion" distortion at the long end of a zoom, change the mode to "correct" instead of "distort".
answered 3 hours ago
junkyardsparkle
4,325924
Good info. But I believe that lensfun 0.3.95 (development) has info for the G5 X, so perhaps just an update to 0.3.95 is all that's necessary?
– scottbb
1 hour ago
add a comment |Â
up vote
3
down vote
accepted
up vote
3
down vote
accepted
Unfortunately, as of right now, darktable doesn't have a very good way of doing ad hoc distortion correction for a lens you don't have a lensfun profile for. The following is a dirty hack that may be useful in cases where the barrel distortion at the wide end of a zoom is so strong that even "incorrect" correction might be an improvement...
In the lens correction module, click on the top (camera) dropdown list, and manually select "Crop-factor 1.0 (Full Frame)" from the "Generic" menu category, then similarly for the lens dropdown select Generic>Rectilinear 10-1000mm f/1.0. Change the "geometry" setting to "fish-eye", and the "mode" setting to "distort". Now, when you change the value in the "mm" dropdown menu, you should get different degrees of generic "defishing"; start at the largest mm values and work down the list until you find something that looks closest to correct. Clicking the circular arrow button to the right of the "scale" slider will auto-adjust the scale to the largest crop with no blank pixels.
If you're trying to correct "pincushion" distortion at the long end of a zoom, change the mode to "correct" instead of "distort".
answered 3 hours ago
junkyardsparkle
4,325924
Unfortunately, as of right now, darktable doesn't have a very good way of doing ad hoc distortion correction for a lens you don't have a lensfun profile for. The following is a dirty hack that may be useful in cases where the barrel distortion at the wide end of a zoom is so strong that even "incorrect" correction might be an improvement...
In the lens correction module, click on the top (camera) dropdown list, and manually select "Crop-factor 1.0 (Full Frame)" from the "Generic" menu category, then similarly for the lens dropdown select Generic>Rectilinear 10-1000mm f/1.0. Change the "geometry" setting to "fish-eye", and the "mode" setting to "distort". Now, when you change the value in the "mm" dropdown menu, you should get different degrees of generic "defishing"; start at the largest mm values and work down the list until you find something that looks closest to correct. Clicking the circular arrow button to the right of the "scale" slider will auto-adjust the scale to the largest crop with no blank pixels.
If you're trying to correct "pincushion" distortion at the long end of a zoom, change the mode to "correct" instead of "distort".
answered 3 hours ago
junkyardsparkle
4,325924
answered 3 hours ago
junkyardsparkle
4,325924
answered 3 hours ago
junkyardsparkle
4,325924
answered 3 hours ago
junkyardsparkle
4,325924
4,325924
Good info. But I believe that lensfun 0.3.95 (development) has info for the G5 X, so perhaps just an update to 0.3.95 is all that's necessary?
– scottbb
1 hour ago
add a comment |Â
Good info. But I believe that lensfun 0.3.95 (development) has info for the G5 X, so perhaps just an update to 0.3.95 is all that's necessary?
– scottbb
1 hour ago
Good info. But I believe that lensfun 0.3.95 (development) has info for the G5 X, so perhaps just an update to 0.3.95 is all that's necessary?
– scottbb
1 hour ago
Good info. But I believe that lensfun 0.3.95 (development) has info for the G5 X, so perhaps just an update to 0.3.95 is all that's necessary?
– scottbb
1 hour ago
add a comment |Â
quiliup is a new contributor. Be nice, and check out our Code of Conduct.
quiliup is a new contributor. Be nice, and check out our Code of Conduct.
quiliup is a new contributor. Be nice, and check out our Code of Conduct.
quiliup is a new contributor. Be nice, and check out our Code of Conduct.
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2
Related (ignoring the specific lens/body): Darktable doesn't recognize tamron 18-270mm lens
– scottbb
3 hours ago
Possible duplicate of Darktable doesn't recognize tamron 18-270mm lens
– Romeo Ninov
1 hour ago