![]() In my view, it would also make sense that these are combined in the ‘crop and rotate’ module, as most of the time, perspective correction is done simultaneously with cropping of the image. It would be nice if this value was given by default - the user would then still have the opportunity to make a fine adjustment.Īnd finally, I think it would make sense that the 2 ways of making the perspective correction would be combined in the same module, where the user would have the option of manual (with 4 handles that are dragged to 4 corners of a rectangular object) or automatic (where line segments are automatically generated) procedure. These 2 angles are not necessarily known by the photographer, but they surely are computed within the perspective correction algorith.įor example, if shoot a view with a 20 degrees vertical shift and a 5 degrees horizontal shift, then adjusting the slider to 0.94 would give the appropriate correction in aspect ratio. ![]() (aspect ratio correction) = cos (vertical angle shift) / cos (horizontal angle shift) From what I can see it would be a formula of the type: I would think the correct aspect ratio correction could be fairly easily computed. actively developing the application, from the perspective of the device. But if the original is a rectangle, then it becomes very difficult to properly adjust the aspect ratio (unless one knows the exact dimensions of the original object). Darktable is an open source photography workflow application and raw developer. Darktable hopes to release a pair of major updates each year. The latest update is the first of two planned feature releases, with the second intended to come out this winter. It is relatively easy to do it if the original object is square, then one can slide the cursor until the result apprears square. The darktable team has announced its second summer feature release, bringing darktable to version 3.6. However, for my part I prefer to use the manual perspective correction from the ‘Crop and rotate’ module - and in that module, the aspect ratio correction slider is not available.Īnother thing, this aspect ratio correction is fully manual. To Paulmiller, thanks for pointing the possibility of changing the aspect ratio when selecting the specific lens model.
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