The command I´m using is "convert <source> -channel RGBA -contrast-stretch 1% -quality 100 <destination>" which delivers amazing results used with underwater-pictures. But, as I already mentioned, only if it´s invoked manually.
I already thought about differences using ' or " (I´m running a german version of windows) etc. But I don´t get it.
To show what it´s about (original, manually invoked, invoked via batch):
![Image](http://i1119.photobucket.com/albums/k623/xover5/images.jpg?t=1290277138)
Any idea/suggestion/explanation would absolutely be appreciated, thanks.