Is the color-picker buggy?

I recently tried to pick a flat normal color from an image in the UV-Editor.

It returned (0.2,0.2,1.0) instead of (0.5,0.5,1.0).

I checked the color in gimp and it is indeed (0.5,0.5,1.0).

Did i something wrong or is there a bug?

BTW: Hovering over the image and pressing LMB shows (0.5,0.5,1.0) too. Although the picked color seems to match the color displayed in the UV-Editor. This is strange.