nanshe/io/xtiff.py: Only grab descriptions from pages associated with the relevant channel.
nanshe/io/xtiff.py: Only grab descriptions from pages associated with the relevant channel.

jakirkham/nanshe,nanshe-org/nanshe,jakirkham/nanshe,DudLab/nanshe,DudLab/nanshe,nanshe-org/nanshe