Still, from time to time we encounter comments from people accusing us of ignorance or even disrespect towards Windows users. If you're trying to correct "pincushion" distortion at the long end of a zoom, change the mode to "correct" instead of "distort". Due to the heated debate lately, a short foreword: We do not want to harass, insult or criticize anyone due to his or her choice of operating system. I had a quick look & thought it needed gamma correction rather than exposure, but then a general blue/green shift too, to make it match the left side a bit better. 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. 111 1 Can you add a mask in Darktable This is relatively simple in Photoshop, probably also in Gimp too, mask one half treat the other. 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. For the lens dropdown: Select Generic -> Rectilinear 10-1000mm f/1.0.Click on the top (camera) dropdown list and select Generic -> Crop-factor 1.0 (Full Frame).What if we would like to work on and make multiple edited versions of image.jpg instead, and produce multiple different sidecar files containing alternative edit histories for them in the process to compare later for choosing one in the end (Without copy and.
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 Darktable, you can only import the same image once as image.jpg for example. 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.
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