FIX: check

Author: larsoner

nibabel/nifti1.py

@@ -2443,14 +2443,18 @@ def _get_analyze_compat_dtype(arr):
         return np.dtype('int16' if arr.max() <= np.iinfo(np.int16).max else 'int32')
 
     mn, mx = arr.min(), arr.max()
-    if (isinstance(mn, int) and isinstance(mx, int)) or (
-        np.can_cast(mn, np.int32) and np.can_cast(mx, np.int32)
-    ):
+    if np.can_cast(mn, np.int32) and np.can_cast(mx, np.int32):
         return np.dtype('int32')
-    if (isinstance(mn, float) and isinstance(mx, float)) or (
-        np.can_cast(mn, np.float32) and np.can_cast(mx, np.float32)
-    ):
+    elif (isinstance(mn, int) and isinstance(mx, int)):
+        info = np.finfo('int32')
+        if mn >= info.min and mx <= info.max:
+            return np.dtype('int32')
+    if np.can_cast(mn, np.float32) and np.can_cast(mx, np.float32):
         return np.dtype('float32')
+    elif (isinstance(mn, float) and isinstance(mx, float):
+        info = np.finfo('float32')
+        if mn >= info.min and mx <= info.max:
+            return np.dtype('float32')
 
     raise ValueError(
         f'Cannot find analyze-compatible dtype for array with dtype={dtype} (min={mn}, max={mx})'