Colour Trouble

I am new to using photoshop. I had my friend over to teach me some tricks and now somehow my colour is stuffed up.
The colours I choose to use seems to be opposite to what it is on the colour swatch (e.g. black to white and green to purple) and it also sometimes turns to neon colours when drawn on images. Please help ><

tofu,

You have to be more specific: OS and PS versions, whether your monitor is calibrated (and how), which specific color spaces for what type and mode of images, exactly how you are selecting color, etc.

We can't see your computer from here, so please post details. Thanks.

Neil

My first guess is that the monitor profile is hosed.

Buko,

My thinking too...but without the details, you never know for sure.

Neil

I always thought you could read minds Neil. B)

Na, he only reads post and prays that the tide is going out.

Ah the old Pray the tide is going out trick!

Thanks, guys!

Now, if we can wait till tofu-san posts back. ;-)

Neil

Well we could but its more fun to ramble on till tofu gets back.

I'm not sure how to be specific about this @@ ... but I'm using Photoshop CS3 on Mac OS. When drawn on a blank document, the colour just doesn't correspond to the colour i pick. (I pick colour through the swatches)

On a normal camera taken image on RGB mode, there seems to be a mix of colour (when using green purple shows up with a hint of green).. I hope this help. Um.. it was okay when I first installed it, but since the little "experimentation" with my friend it has been like this.

Is there someway I can upload the images to show you guys?

Oh.. It's working now... I seem to have done something stupid == Thanks and sorry for the trouble ><

He probably inverted his colors

Yup.

You need to do this forum the courtesy of explaining what you did to fix it.