I am quite pleased with the result.
The halo comes up particularly well in colour.
90m L 60m R, 60m G,60m B BRC-250 scope.
The processing involved subtracting the skyglow and applying 4 iterations of the pixel mapping routine.
Ordinarily sky subtracting for a bright object such as NGC 253 is not necessary but the halo is considerably fainter than the main body of the galaxy.
High resolution image here.
http://members.iinet.net.au/~sjastro...olour_halo.jpg
As a comparison the image was processed normally.
http://members.iinet.net.au/~sjastro/ngc253latest.jpg
Clear skies
Steven