Update --help description
Update README and manpage
Fix build
enable HDR image format
Optimization for applying palette
Fix memory leak
Handle out-of-memory errors
Fix the signature of LSS_Scale
Add -O3 to CFLAGS
Minor fix around switching diffusion method
Strip a trailing space
Add enum definition identifying methods for re-sampling
Add methodForResampling argument to LSS_scale signature
Workaround for the environment where M_PI is not defined
Add missing include delective
Add various resampling functions
Minor fix of normalize function
Make LSS_scale enable to switch scaling method
Add -r/--resampling option to img2sixel
Cleanup