Dear a1ex, thank you for the info.
But I don't mean a post-processing after taking photos, I mean a correcting level processing from the beginning when taking pictures.
Even though I try to take a skewed picture, it corrects automatically.
Plus 1) if it's possible, it would be better to process without rotating and cropping.
Plus 2) The reason why I ask you for this is I saw a small device attachment to 6mm DV camcorder with the same function. (REAL-TIME auto level correction device.)
But I don't mean a post-processing after taking photos, I mean a correcting level processing from the beginning when taking pictures.
Even though I try to take a skewed picture, it corrects automatically.
Plus 1) if it's possible, it would be better to process without rotating and cropping.
Plus 2) The reason why I ask you for this is I saw a small device attachment to 6mm DV camcorder with the same function. (REAL-TIME auto level correction device.)