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Rasterize colorbar when it has many colors; closes #4480 #4481

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Merged
merged 1 commit into from
Jun 8, 2015
Merged

Rasterize colorbar when it has many colors; closes #4480 #4481

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10 changes: 10 additions & 0 deletions doc/users/whats_new/rasterized_colorbar.rst
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Original file line number Diff line number Diff line change
@@ -0,0 +1,10 @@
Dense colorbars are rasterized
``````````````````````````````
Vector file formats (pdf, ps, svg) are efficient for
many types of plot element, but for some they can yield
excessive file size and even rendering artifacts, depending
on the renderer used for screen display. This is a problem
for colorbars that show a large number of shades, as is
most commonly the case. Now, if a colorbar is showing
50 or more colors, it will be rasterized in vector
backends.
4 changes: 4 additions & 0 deletions lib/matplotlib/colorbar.py
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Expand Up @@ -256,6 +256,8 @@ class ColorbarBase(cm.ScalarMappable):
'min': slice(1, None),
'max': slice(0, -1)}

n_rasterize = 50 # rasterize solids if number of colors >= n_rasterize

def __init__(self, ax, cmap=None,
norm=None,
alpha=None,
Expand Down Expand Up @@ -517,6 +519,8 @@ def _add_solids(self, X, Y, C):
colors=(mpl.rcParams['axes.edgecolor'],),
linewidths=linewidths)
self.ax.add_collection(self.dividers)
elif len(self._y) >= self.n_rasterize:
self.solids.set_rasterized(True)

def add_lines(self, levels, colors, linewidths, erase=True):
'''
Expand Down