Re: [Matplotlib-users] Transparent figures no longer working

[Eric F. <ef...@ha...>]

T J wrote:
> On Wed, Apr 28, 2010 at 12:22 PM, Eric Firing <ef...@ha...> wrote:
>> It's a bug, made more confusing by the trickery that is done when printing a
>> figure.  DPI, facecolor, and edgecolor that are set for a figure object are
>> used only for screen display, and are overridden when the figure is saved.
>>  The overriding values can be supplied to the savefig call or via rcParams.
>>
>> I think I have fixed the bug in svn, so that "transparent" will work as
>> advertised.  In addition, I made a change so that even with
>> transparent=True, if you supply facecolor and/or edgecolor to the savefig
>> call, those values should be used for the figure patch when the figure is
>> saved.  This might be useful if you want to keep the line around the figure,
>> for example.
>>
> 
> This still does not work for me.  I dug around a bit and found an
> issue.  Figure.savefig() sets the 'edgecolor' and 'facecolor' of the
> axis patches but delegates the patches of the figure to the actual
> print command.  It does this by setting the edgecolor and facecolor
> values in the kwargs dict.  However, self.canvas.print_figure()
> expects edgecolor and facecolor as args, not kwargs.  So
> print_figure() uses the default value: 'w' instead of 'none'.  This is
> a bit inconsistent, it seems, especially b/c the PS backend  (which is
> called after print_figure()) expects facecolor and edgecolor as
> kwargs.

I don't see this in the version as I changed it in svn r8282.  Are you 
sure you installed and built from svn after I made the change?  Using 
the attached script,  I get the two attached (gzipped) eps files. The 
first with transparent=True, has no fill operations other than for 
generation of the glyphs; the second differs from the first in having 
two extra fill operations, one for the axes patch, the other for the 
figure patch.

When I use your transeps.tex, run latex, and then dvips, the resulting 
ps file (also gzipped and attached) has the figure with a red 
background, sitting on a white page.  I presume this is what you expect, 
and so the figure and axes really are transparent.

Eric

> 
> I went ahead and changed this, hoping it'd fix the issue, but it does
> not.  At least now, I can see that the edgecolor and facecolor are
> both set to 'none' all the way until self.figure.draw(renderer) is
> called.  So somehow, the draw() command is unaffected by this still.
> 
> What next?
> 
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