After doing some work on an image I felt that the scene would have more strength if it was reversed. I was surprised to find that one edge of the image was cropped differently (and unacceptably) after the reversal. I tried to move the orientation to the end of the process but it appears to have a fixed location. … interesting!
I think crop just uses an xy pixel coordinate to make the crop. So if you’re going to flip the image, you’ll need to revisit the crop module.
It looks to me like the end result is a shift. There is more at the after-left than there was in the before-right, and less at the after-right than there was in the before-left. I expect Mica’s explanation accounts for that.
I think I know what happened…
The crop is a mask, instead of flipping the image and the crop as one, the crop coordinates stay where they are and the image is flipped, left to right, and the upper right corner becomes the new left 0,0 when flipped R2L (or is that L2R?) and gets ‘shifted’.
Try the flip first, and then the crop. When it looks like what you were expecting from the previous attempt, flip it again and does it show a similar offset?
I hope this makes sense, it is late where i am and i’m really tired.
