Fuji raw file problems

Question

Lr 4.4 dng file looks much worse than jpeg out of my Fuji 770exr camera ... why would this happen?  Thanks

Answer 1

Screen-shots of what you’re seeing will help responses be less than wild guesses as to what you’re seeing.  Converting to DNG doesn’t change exposure and doesn’t add lines to an image so something else is going on.
Regarding the overexposed and washed out shots, Nikon cameras have an ADL (Auto Dynamic Lighting) setting and Canon cameras have an ALO (Auto Lighting Optimization) setting, which cause the camera to automatically fix bad exposures before it writes the JPG.  If your Fuji camera has such a setting, and you plan on shooting raw, then turn off this auto-fix setting, because it is just hiding poor technique or challenging lighting situations and will be confusing when you work with your raws in a non-Fuji raw converter like Lightroom. 
Lightroom does have a Auto Toning button that you can press to get LR’s attempt at auto-fixing the exposure but it doesn’t work in many situations, especially the Auto Exposure settings.  I usually click LR's Auto to get the Black and the White sliders set and then undo the Exposure setting which is usually not right, having adjusted itself based on a small specular highlight or bit of overexposed sky that isn't part of the subject and darking the whole shot unnecessarily.
About horizontal lines, without seeing what you’re talking about, it could be a number of things:  high-ISO noise banding from the sensor, video-driver issues on your computer, bad-memory chips on your computer, corruption during transfer, hard-drive failure, where except the high-ISO niose, all might be a change to the raw data after it gets to your computer and have nothing to do with LR or your camera.
Are you shooting RAW+JPG and comparing the camera jpg and LR-DNG of the same shot?
Besides screen-shots, an actual DNG, or preferably the raw file before converting to DNG, along with the corresponding JPG if you're shooting RAW+JPG, would be helpful for others to look at, here, to see if the same issues are apparent on their computers or not.  This would help narrow down if it is a hardware issue on your side or something LR is doing.  You cannot attach a large file to a forum message, but you can upload one to www.dropbox.com or www.skydrive.com or similar large-file-hosting service, and post the public download link to it, here, in a message.
You also should be using the latest LR 4.4 with Fuji cameras that have the new X-Trans sensor.  Converting to DNG with prior versions of LR (< 4.4) or a previous version of the standalone DNG converter (<7.4) will have a sub-optimal demosaicking algorithm applied which kills detail, especially color detail, neither of which seem to be what you're describing but it would be useful to understand if you are using LR 4.4 or a previous version.