matplotlib
diff --git a/‎lib/matplotlib/colorbar.py
Copy file name to clipboardExpand all lines: lib/matplotlib/colorbar.py
+2Lines changed: 2 additions & 0 deletions b/‎lib/matplotlib/colorbar.py
Copy file name to clipboardExpand all lines: lib/matplotlib/colorbar.py
+2Lines changed: 2 additions & 0 deletions
@@ -839,6 +839,7 @@ def _get_ticker_locator_formatter(self):
                 # default locator:
                 nv = len(self._values)
                 base = 1 + int(nv / 10)
+                # put ticks on integers between the boundaries of NoNorm...
                 locator = ticker.IndexLocator(base=base, offset=.5)
 
         if minorlocator is None:
@@ -1098,6 +1099,7 @@ def _process_values(self):
         if isinstance(self.norm, colors.BoundaryNorm):
             b = self.norm.boundaries
         elif isinstance(self.norm, colors.NoNorm):
+            # NoNorm has N blocks, so N+1 boundaries, cantered on integers:
             b = np.arange(self.cmap.N + 1) - .5
         else:
             # otherwise make the boundaries from the size of the cmap: