There are a few things I do to make my 3D images look better.
1. Keep your lens(es) clean. Many phone-cam photos are degraded significantly because the camera lens was covered in finger prints or (smokers) cigarette smoke 'grime'. Another issue in hot weather is moving between cool indoor locations and hot outdoor locations quickly. Your cool camera will cause water in the air to condense on the lenses and any photos will be foggy. If you can, wipe them clear...or just wait for the phone / camera to warm up and the fog to lift.
2. Cameras like the LG Optimus 3D phone tend to produce a murky photo if running Android v2.2. It's just the way the default settings are set in that version. This has been fixed in the Android v2.3.5 update for this device. In any case, you can use the included "Image Editor" app (accessed via 'edit' in the camera or from the Gallery) to improve the image. I typically:
- increase RGB by one to the right
- Increase saturation by one to the right
- maybe increase contrast by one to the right....but usually not necessary where there is enough light.
If you're on Android v2.2, these steps make the photo look much closer to what your eyes saw. If you're on Android v2.3.5 I usually still 'restore' the saturation as above and - depending in the conditions when the photo was taken - may still adjust the RGB and / or the contrast. See what looks best to you.
For other camera / devices you may have your own apps that can do this. I use "StereoPhoto Maker" on Windows (or in WINE on Linux). GIMP is fine....though you'll have to save the file as a JPEG, then rename it back to *.JPS. I also use this app to 'fix' alignment. Some cameras, like the Fuji Real 3D W3, can have the two lenses out of alignment...either from the factory or because you dropped it once or many times. Whatever...the image is almost always fixable.
On an Android phone, you can use 3D Steroid Pro to fix alignment of *.jps and *.mpo files. Better alignment means fewer headaches for 3D viewers.
Anyone else have any suggestions?
(Edited 2012 03 12 to include information about Android v2.3.5).