psykomyko wrote:
It's possible to digitally erase and replace the grayscale tones without affecting the line art - I had this done on manga retouch back in the day, before Tokyopop's cheap/half-assed production became the standard - but as I'm sure you know it can be a real pain!

Are you talking LW&C?  If so, then you'll recall that I know EXACTLY what you're talking about! :P