This is a small detail from picture that was taken by a cheap SX Canon in low light (ISO 100 0.8sec f/5). Maybe also the (auto) focus isn't good enough. The Jpeg (upper) is much more readable. How would you edit it (for example in UFRaw) to get at least that readability?
Nothing that I tried in UFRaw improved the picture. I would guess that it's more a matter of sharpness filter in a common photo editor. But does jpeg creation include a sharpness filter?