I was wondering about this as well, but I figured that it doesn't seem to be a bug at all. The reason why it looks for some of you "correct" in Gimp is, because you don't have color management for your monitor enabled in the preferences (either set a specific monitor profile there, or tick the fallback option, which will make it use the color profile from the window manager).
Thus, what Gimp is showing you all is the image without your monitor profile applied, while EOG always uses your monitor profile. So when the image in EOG looks dull to you, that's actually how it's supposed to look like.
I was wondering about this as well, but I figured that it doesn't seem to be a bug at all. The reason why it looks for some of you "correct" in Gimp is, because you don't have color management for your monitor enabled in the preferences (either set a specific monitor profile there, or tick the fallback option, which will make it use the color profile from the window manager).
Thus, what Gimp is showing you all is the image without your monitor profile applied, while EOG always uses your monitor profile. So when the image in EOG looks dull to you, that's actually how it's supposed to look like.