Default autoscaling should match (or improve upon) ImageJ1's method #30
Open the T1 Head sample. Save to TIFF, then reopen in the ImageJ2 Swing UI. Instead of being set to 3-521 like ImageJ1 does, the range will be set differently. The reason is probably that ImageJ1's default autoscaling is not a naive min-to-max but rather a statistical range computation.