Inverted Colours after converting images

Hey Guys,
i got a huge Problem. At my Office I have an Intel iMac 7.1. I have to convert .tiff-files into .Jpg and sometimes resize them into low resolution.
I'm using the Automator for it (Finder same Problem).
The converted Images are inverted. Funny thing is: If i put these images onto a Win PC, the files a normal, not inverted.
If I edit the converted images on the iMac again,they will displayed at the iMac normally again. However these files are inverted on a normal PC.
Do you understand me? I need to fix this bug, because i cannot work if there are 1. inverted colours in e.g. resized pictures and 2. i dont know if they have normal colours on a PC or not..
If someone of you could help me, it would be amazing..
While looking at goole, i just found one page where it says that this is an old bug from Mac OSX. But i dont have that prob at my Macbook and I never saw that somewhere..
Sorry for my mistakes, not my foreign language..
Greetz and THANKS
Chrostiffer

chrostiffer --
Go here:
Apple icon (top left of screen) double click to System Preferences.
Open up Universal Access (bottom of that pane). Go to display, and make sure the dot next to
"Black on White" is selected, not "White on Black."
The keyboard shortcut is pressing the Apple/Command, Alt/Option, and Control keys all at the same time , along with the number 8 key.

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