Thanks for the many useful responses - I eventuallyfound by experiment that
imshow( interpolation='nearest' works *if* I write a png file.
Saving a pdf file mushed up my crisp pixel boundaries. However, saving as png,
then using (mac osx) preview to convert to pdf worked fine.
Go figure()!
I
I ask having trouble getting imshow to plot e.g. a detector image showing
pixels as little rectangular or square uniform color blocks - imshow seems to
want to interpolate or smooth the image.
Using imshow("nearest") still produces a 'soft' image.
I have solved this problem earlier using figimag
