Show error message for duplicate start.
rename variable.
Fix resume page misplaced problem.
Implement 4 bit depth fray scale with gamma correction by RenderScript.
Handle blank page.
Handle gamma correction overflow. (17*17 = 289 > 255).
clamp is float only. use rsClamp.
Fix gamma collection.
Centering image and fit to screen size.
Remove debug message and comment-out code.
Use ACTION_VIEW intent for finish notification.