This enumeration determines the general color characteristic of the light source used to acquire the image.

Values:

IG_TW_LS_BLUE	Blue
IG_TW_LS_GREEN	Green
IG_TW_LS_IR	IR
IG_TW_LS_NONE	None
IG_TW_LS_RED	Red
IG_TW_LS_UV	UV
IG_TW_LS_WHITE	White