Image quality deteriorates when the page is published Edited

[Aleg Kavalenka]

When I insert images into the page, I resize them and they look good. But when I hit the Update or Close button to exit the edit mode, the image quality drastically goes down. I'm using Confluence 6.2.0.

[Steffen Heller]

How do you "publish" your pages?

[Aleg Kavalenka]

Sorry, the button is labelled as "Update" for already published pages. Anyway, I think there is some issue.

You can see it on the following snapshots:

1. This is how the image looks on the page in Edit mode:

2. This how it looks after I exit the Edit mode:

[Steffen Heller]

Just a guess:
Do you resize the image to less than 300 Pixel?
Does the problem also appear when you resize to a size bigger than 300 Pixel?