diff --git a/skimage/transform/_geometric.py b/skimage/transform/_geometric.py
index 092738bc..d5b25b6d 100644
--- a/skimage/transform/_geometric.py
+++ b/skimage/transform/_geometric.py
@@ -1033,31 +1033,31 @@ def warp(image, inverse_map=None, map_args={}, output_shape=None, order=1,
     >>> image = data.camera()
 
     The following image warps are all equal but differ substantially in
-    execution time.
+    execution time. The image is shifted to the bottom.
 
     Use a geometric transform to warp an image (fast):
 
     >>> from skimage.transform import SimilarityTransform
     >>> tform = SimilarityTransform(translation=(0, -10))
-    >>> warp(image, tform) # doctest: +SKIP
+    >>> warped = warp(image, tform)
 
-    Shift an image to the right with a callable (slow):
+    Use a callable (slow):
 
-    >>> def shift(xy):
+    >>> def shift_down(xy):
     ...     xy[:, 1] -= 10
     ...     return xy
-    >>> warp(image, shift_right) # doctest: +SKIP
+    >>> warped = warp(image, shift_down)
 
     Use a transformation matrix to warp an image (fast):
 
     >>> matrix = np.array([[1, 0, 0], [0, 1, -10], [0, 0, 1]])
-    >>> warp(image, matrix) # doctest: +SKIP
+    >>> warped = warp(image, matrix)
     >>> from skimage.transform import ProjectiveTransform
-    >>> warp(image, ProjectiveTransform(matrix=matrix)) # doctest: +SKIP
+    >>> warped = warp(image, ProjectiveTransform(matrix=matrix))
 
     You can also use the inverse of a geometric transformation (fast):
 
-    >>> warp(image, tform.inverse) # doctest: +SKIP
+    >>> warped = warp(image, tform.inverse)
 
     """
     # Backward API compatibility
diff --git a/skimage/util/_regular_grid.py b/skimage/util/_regular_grid.py
index f4955a2d..92b32082 100644
--- a/skimage/util/_regular_grid.py
+++ b/skimage/util/_regular_grid.py
@@ -29,21 +29,21 @@ def regular_grid(ar_shape, n_points):
     >>> ar = np.zeros((20, 40))
     >>> g = regular_grid(ar.shape, 8)
     >>> g
-    [slice(5.0, None, 10.0), slice(5.0, None, 10.0)]
+    [slice(5, None, 10), slice(5, None, 10)]
     >>> ar[g] = 1
     >>> ar.sum()
     8.0
     >>> ar = np.zeros((20, 40))
     >>> g = regular_grid(ar.shape, 32)
     >>> g
-    [slice(2.0, None, 5.0), slice(2.0, None, 5.0)]
+    [slice(2, None, 5), slice(2, None, 5)]
     >>> ar[g] = 1
     >>> ar.sum()
     32.0
     >>> ar = np.zeros((3, 20, 40))
     >>> g = regular_grid(ar.shape, 8)
     >>> g
-    [slice(1.0, None, 3.0), slice(5.0, None, 10.0), slice(5.0, None, 10.0)]
+    [slice(1, None, 3), slice(5, None, 10), slice(5, None, 10)]
     >>> ar[g] = 1
     >>> ar.sum()
     8.0
diff --git a/skimage/viewer/plugins/base.py b/skimage/viewer/plugins/base.py
index fb85fbde..dd3aebb0 100644
--- a/skimage/viewer/plugins/base.py
+++ b/skimage/viewer/plugins/base.py
@@ -16,7 +16,6 @@ else:
     has_qt = False
 
 
-@doctest_skip_parser
 class Plugin(QtGui.QDialog):
     """Base class for plugins that interact with an ImageViewer.
 
@@ -60,12 +59,12 @@ class Plugin(QtGui.QDialog):
     >>> from skimage import data
     >>>
     >>> plugin = Plugin(image_filter=lambda img,
-    ...                 threshold: img > threshold) # skip if not has_qt
-    >>> plugin += Slider('threshold', 0, 255)       # skip if not has_qt
+    ...                 threshold: img > threshold) # doctest: +SKIP
+    >>> plugin += Slider('threshold', 0, 255)       # doctest: +SKIP
     >>>
     >>> image = data.coins()
-    >>> viewer = ImageViewer(image) # skip if not has_qt
-    >>> viewer += plugin            # skip if not has_qt
+    >>> viewer = ImageViewer(image) # doctest: +SKIP
+    >>> viewer += plugin            # doctest: +SKIP
     >>> viewer.show()               # doctest: +SKIP
 
     The plugin will automatically delegate parameters to `image_filter` based
diff --git a/skimage/viewer/viewers/core.py b/skimage/viewer/viewers/core.py
index 1928a178..32c10cd4 100644
--- a/skimage/viewer/viewers/core.py
+++ b/skimage/viewer/viewers/core.py
@@ -51,7 +51,6 @@ def mpl_image_to_rgba(mpl_image):
     return img_as_float(image)
 
 
-@doctest_skip_parser
 class ImageViewer(QtGui.QMainWindow):
     """Viewer for displaying images.
 
@@ -79,7 +78,7 @@ class ImageViewer(QtGui.QMainWindow):
     --------
     >>> from skimage import data
     >>> image = data.coins()
-    >>> viewer = ImageViewer(image) # skip if not has_qt
+    >>> viewer = ImageViewer(image) # doctest: +SKIP
     >>> viewer.show()               # doctest: +SKIP
 
     """