White : Deepsky Astrophoto with CCD is very difficult, you must use very fine (3nm 6nm) narrowband filter astrophoto with DLSR is very very hard

Magenta : Astrophoto with DLSR is possible , but like CDD you should use narrowband filter . With DLSR you can use UHC filter with good result

Red : Light pollution is not the dominant factor. its here but far away,. With DLSR you can use IDAS LPS light pollution rejection

Orange : you can shoot DeepSky with CCD an DSLR without filter in short exposure (less 5min)

Yellow : you can shoot DeepSky with CCD an DSLR without filter in short exposure (less 7min)

Green : you can shoot without filter : 10min exposure max

Cyan : you can shoot 15min exposure with CCD, more with DLSR

Blue : 20min exposure with CCD no limit with DLSR

Night blue : 30min exposure with CCD

Black (green by texture transparency) : no limit