Created attachment 52056 [details]
This is the original image, which is then mirrored and flipped in the other attachements.

Version:           unspecified (using KDE 4.5.1) 
OS:                Linux

When I use the 'mirror' or 'flip' tools in Gwenview 2.5.0 (I don't know the english strings for that as I don't use english locale, but these are the tools that flips the image either horiz. or vert.) and then I save the image as a new file, it is displayed ok, but when I reload the picture, you can see the original unflipped image in the background and over that is the new flipped image, but it is shifted either to the left (mirror) or to the top (flip) by some amount of pixels, therefore enabling you to see the original image beneath it (see the attachements for better understanding). Interesting is, that it doesn't happen with all images. I'll upload two testcases so you can see.

Reproducible: Always

Steps to Reproduce:
1. Open the image
2. Use Mirror or Flip tool

Actual Results:  
The image is displayed as it should be, but it is not saved that way.

Expected Results:  
Have the image saved ok (what I see is what I want to have saved).

I'm marking this bug as a major as it describes it as 'bug that causes data loss', which this bug certainly does (worst case scenairo would be if you'd overwritte your original image).