For some reason, I could not paint certain pictures (early scans of the series) of a volume. I could not even paint on the most bright area regardless of the threshold settings. Has anyone encountered similar problem and how you solve it? Thank you so much in advance!
Check out these FAQs and let us know if it solved your problem.
I can paint again after playing geometry of the master volume. I changed the oversampling factor to some a number and then changed it back to 1. it made the difference!! Thank you so much!!