Colours look all wrong in Photoshop

[Creepy Doll]

This is really starting to bug me.

For some reason the pictures look the same when I view them full size in my web browser (Firefox), but I can see the difference in these thumbnails below (and of course on my computer).
If you see no difference in the pictures no matter how you view them:
The noise in the photo, while at about the same level, is somehow worse when I view the photo in Photoshop. The colour green is more prevalent and it kind of looks like there's some colour banding going on.

How it appears outside of Photshop:




And how it appears in Photoshop:



Something to do with Color Settings in the Edit menu?

[Pieter]

When saving, untick the "embed color profile" box and see if that helps.
Check if your standard color model is sRGB.

[Creepy Doll]

When saving, untick the "embed color profile" box and see if that helps.

The only option I see is "ICC Profile: (whatever profile the document is using)"

Same thing?

But it shouldn't matter because the photos are like that the moment I load them up in Photoshop.

Check if your standard color model is sRGB.

It is at the moment, but I' was playing around with it some before to see if something would change.

[Pieter]

The only option I see is "ICC Profile: (whatever profile the document is using)"

Same thing?

But it shouldn't matter because the photos are like that the moment I load them up in Photoshop.

Yes same thing, it tells programs and printers which color model the document is in. Unless you print professionally yourself there's no need to have it, and it might cause slight color mismatches.

Another thing might be that your photos are 16 bit and Photoshop is only displaying 8 bits, so colors get downsampled untill you save the file and view it externally. This is why you'll sometimes see banding in PS where it won't show up in other image viewers.

[Creepy Doll]

Another thing might be that your photos are 16 bit and Photoshop is only displaying 8 bits, so colors get downsampled untill you save the file and view it externally. This is why you'll sometimes see banding in PS where it won't show up in other image viewers.

If this is the case what can I do about it?

[TheEYE]

It could also be your dpi settings. If your picture is say 300 dpi, and you open it in PS at 150 dpi that can happen. You will usually notice a size difference between the original and the PS copy if that is the case as well.

[Pieter]

If this is the case what can I do about it?

You could convert it to 8-bit, or you could just ignore it.
Image -> Mode -> 8-bit

Photoshop also uses hardware acceleration for graphics, so check if you have some kind of profile loaded for it in your graphics card driver.
Seems unlikely this is the problem tough, but who knows.

If it stays a problem, simply copying and pasting into a fresh document can do wonders sometimes.