I am used to take daily pictures of the Sun, which appear as a filled circle on a black background.
Such pictures have to be derotated by a certain angle to get the solar North exactly upwards and the South downwards in the x and y reference system of the image.
Anyway, being an AP-iPad newbie, I have been not very successful with the relevant workflows I have tried.
In fact, I have used the canvas rotation feature, which worked fine, but this resulted in an image which was obviously not squared in x and y. Hence, I have been unable to fill the missing parts to get a squared image that can be saved.
Then, I have tried to work with a selection containing only the solar disk, but I got lost when trying to save a final image.
Therefore, I would be grateful to get some hints about the most effective way to apply the rotation and to save the result.
Thank you in advance!
