diff --git a/examples/misc/demo_agg_filter.py b/examples/misc/demo_agg_filter.py
index d03b5ae2ae3c..0cdbf81f50b5 100644
--- a/examples/misc/demo_agg_filter.py
+++ b/examples/misc/demo_agg_filter.py
@@ -99,8 +99,19 @@ def process_image(self, padded_src, dpi):
class LightFilter(BaseFilter):
-
- def __init__(self, sigma, fraction=0.5):
+ """Apply LightSource filter"""
+
+ def __init__(self, sigma, fraction=1):
+ """
+ Parameters
+ ----------
+ sigma : float
+ sigma for gaussian filter
+ fraction: number, default: 1
+ Increases or decreases the contrast of the hillshade.
+ See `matplotlib.colors.LightSource`
+
+ """
self.gauss_filter = GaussianFilter(sigma, alpha=1)
self.light_source = LightSource()
self.fraction = fraction
@@ -114,7 +125,8 @@ def process_image(self, padded_src, dpi):
rgb = padded_src[:, :, :3]
alpha = padded_src[:, :, 3:]
rgb2 = self.light_source.shade_rgb(rgb, elevation,
- fraction=self.fraction)
+ fraction=self.fraction,
+ blend_mode="overlay")
return np.concatenate([rgb2, alpha], -1)
@@ -257,7 +269,7 @@ def drop_shadow_patches(ax):
def light_filter_pie(ax):
fracs = [15, 30, 45, 10]
- explode = (0, 0.05, 0, 0)
+ explode = (0.1, 0.2, 0.1, 0.1)
pies = ax.pie(fracs, explode=explode)
light_filter = LightFilter(9)
@@ -267,7 +279,7 @@ def light_filter_pie(ax):
p.set(ec="none",
lw=2)
- gauss = DropShadowFilter(9, offsets=(3, 4), alpha=0.7)
+ gauss = DropShadowFilter(9, offsets=(3, -4), alpha=0.7)
shadow = FilteredArtistList(pies[0], gauss)
ax.add_artist(shadow)
shadow.set_zorder(pies[0][0].get_zorder() - 0.1)
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