diff --git a/viewer_examples/plugins/tv_denoise.py b/viewer_examples/plugins/tv_denoise.py
index 05b57205..370efea3 100644
--- a/viewer_examples/plugins/tv_denoise.py
+++ b/viewer_examples/plugins/tv_denoise.py
@@ -1,22 +1,23 @@
 from skimage import data
 from skimage.restoration import denoise_tv_chambolle
-from numpy import random, clip, uint8
+from skimage.util import img_as_float
+from numpy import random, clip
 
 from skimage.viewer import ImageViewer
 from skimage.viewer.widgets import Slider, CheckBox, OKCancelButtons, SaveButtons
 from skimage.viewer.plugins.base import Plugin
 
 
-image = data.chelsea()
-sigma = 30
+image = img_as_float(data.chelsea())
+sigma = 30/255.
 
 image = image + random.normal(loc=0, scale=sigma, size=image.shape)
-image = clip(image,0,255).astype(uint8)
+image = clip(image,0,1)
 viewer = ImageViewer(image)
 
 plugin = Plugin(image_filter=denoise_tv_chambolle)
-plugin += Slider('weight', 0, 5, value=0.3, value_type='float')
-plugin += Slider('n_iter_max', 1, 1000, value=100, value_type='int')
+plugin += Slider('weight', 0.01, 5, value=0.3, value_type='float')
+plugin += Slider('n_iter_max', 1, 100, value=20, value_type='int')
 plugin += CheckBox('multichannel',value=True)
 plugin += SaveButtons()
 plugin += OKCancelButtons()