4862 Enhance docstring for the regular 2D image dims

monai/transforms/io/array.py

@@ -99,6 +99,10 @@ class LoadImage(Transform):
         - Current default readers: (nii, nii.gz -> NibabelReader), (png, jpg, bmp -> PILReader),
           (npz, npy -> NumpyReader), (nrrd -> NrrdReader), (DICOM file -> ITKReader).
 
+    Please note that for png, jpg, bmp, and other 2D formats, readers often swap axis 0 and 1 after
+    loading the array because the `HW` definition for non-medical specific file formats is different
+    from other common medical packages.
+
     See also:
 
         - tutorial: https://github.com/Project-MONAI/tutorials/blob/master/modules/load_medical_images.ipynb

monai/transforms/io/dictionary.py

@@ -51,6 +51,10 @@ class LoadImaged(MapTransform):
         - Current default readers: (nii, nii.gz -> NibabelReader), (png, jpg, bmp -> PILReader),
           (npz, npy -> NumpyReader), (dcm, DICOM series and others -> ITKReader).
 
+    Please note that for png, jpg, bmp, and other 2D formats, readers often swap axis 0 and 1 after
+    loading the array because the `HW` definition for non-medical specific file formats is different
+    from other common medical packages.
+
     Note:
 
         - If `reader` is specified, the loader will attempt to use the specified readers and the default supported