How to turn Pictures around

[docjackdaniel]

Hello..
I`ve got som problems after uploading some pics.
Some of them some are in landscape format instead of portrait format.
Is there a way to rotate the image by 90 degrees in Coppermine?
I tried it with an image program, it rotated the image but when I uploaded it again (I had previously deleted the incorrectly displayed images in the album using Coppermine) the images were displayed in landscape format again.
I also tried turning Auto-orient image(s) on and off.. The image is still in landscape format..
What or where can I change something?