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Added native dpi option for print_figure #4286

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Apr 11, 2015
Merged

Added native dpi option for print_figure #4286

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f6329f8
Added native dpi option for print_figure
patchen Mar 27, 2015
60f998b
Moved new dpi option to Figure.savefig()
patchen Mar 29, 2015
1f25f15
Added whats new and validation for figure.savefig dpi change
patchen Apr 4, 2015
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9 changes: 9 additions & 0 deletions doc/users/whats_new/updated_figure.rst
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Original file line number Diff line number Diff line change
@@ -0,0 +1,9 @@
Updated Figure.savefig()
------------------------

Added support to save the figure with the same dpi as the figure on the screen using dpi='figure'

Example:
f = plt.figure(dpi=25) # dpi set to 25
S = plt.scatter([1,2,3],[4,5,6])
f.savefig('output.png', dpi='figure') # output savefig dpi set to 25 (same as figure)
7 changes: 5 additions & 2 deletions lib/matplotlib/figure.py
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Expand Up @@ -1424,9 +1424,10 @@ def savefig(self, *args, **kwargs):

Keyword arguments:

*dpi*: [ *None* | ``scalar > 0`` ]
*dpi*: [ *None* | ``scalar > 0`` | 'figure']
The resolution in dots per inch. If *None* it will default to
the value ``savefig.dpi`` in the matplotlibrc file.
the value ``savefig.dpi`` in the matplotlibrc file. If 'figure'
it will set the dpi to be the value of the figure.

*facecolor*, *edgecolor*:
the colors of the figure rectangle
Expand Down Expand Up @@ -1473,6 +1474,8 @@ def savefig(self, *args, **kwargs):
"""

kwargs.setdefault('dpi', rcParams['savefig.dpi'])
if kwargs['dpi'] == 'figure':
kwargs['dpi'] = self.get_dpi()
frameon = kwargs.pop('frameon', rcParams['savefig.frameon'])
transparent = kwargs.pop('transparent',
rcParams['savefig.transparent'])
Expand Down
11 changes: 10 additions & 1 deletion lib/matplotlib/rcsetup.py
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Expand Up @@ -117,6 +117,15 @@ def validate_float_or_None(s):
except ValueError:
raise ValueError('Could not convert "%s" to float' % s)

def validate_dpi(s):
"""confirm s is string 'figure' or convert s to float or raise"""
if s == 'figure':
return s
try:
return float(s)
except ValueError:
raise ValueError('"%s" is not string "figure" or'
' could not convert "%s" to float' % (s, s))

def validate_int(s):
"""convert s to int or raise"""
Expand Down Expand Up @@ -749,7 +758,7 @@ def __call__(self, s):
closedmax=False)],

## Saving figure's properties
'savefig.dpi': [100, validate_float], # DPI
'savefig.dpi': [100, validate_dpi], # DPI
'savefig.facecolor': ['w', validate_color], # facecolor; white
'savefig.edgecolor': ['w', validate_color], # edgecolor; white
'savefig.frameon': [True, validate_bool],
Expand Down