Bug report

Bug summary

Code for reproduction

# Paste your code here
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 318                  bbox=dict(facecolor='none', edgecolor='0.82'), fontweight='bold')
    319
--> 320       plt.savefig(path_main+ '\Graph_cBSi_Para.png', bbox_inches='tight', dpi = 200)
    321
    322       ################ploting color map for S21 data

Actual outcome

c:\program files\python38\lib\site-packages\matplotlib\pyplot.py in savefig(*args, **kwargs)
857 def savefig(*args, **kwargs):
858 fig = gcf()
--> 859 res = fig.savefig(*args, **kwargs)
860 fig.canvas.draw_idle() # need this if 'transparent=True' to reset colors
861 return res

c:\program files\python38\lib\site-packages\matplotlib\figure.py in savefig(self, fname, transparent, **kwargs)
2309 patch.set_edgecolor('none')
2310
-> 2311 self.canvas.print_figure(fname, **kwargs)
2312
2313 if transparent:

c:\program files\python38\lib\site-packages\matplotlib\backends\backend_qt5agg.py in print_figure(self, *args, **kwargs)
79
80 def print_figure(self, *args, **kwargs):
---> 81 super().print_figure(*args, **kwargs)
82 self.draw()
83

c:\program files\python38\lib\site-packages\matplotlib\backend_bases.py in print_figure(self, filename, dpi, facecolor, edgecolor, orientation, format, bbox_inches, pad_inches, bbox_extra_artists, backend, **kwargs)
2191 else suppress())
2192 with ctx:
-> 2193 self.figure.draw(renderer)
2194
2195 bbox_inches = self.figure.get_tightbbox(

c:\program files\python38\lib\site-packages\matplotlib\artist.py in draw_wrapper(artist, renderer, *args, **kwargs)
39 renderer.start_filter()
40
---> 41 return draw(artist, renderer, *args, **kwargs)
42 finally:
43 if artist.get_agg_filter() is not None:

c:\program files\python38\lib\site-packages\matplotlib\figure.py in draw(self, renderer)
1861
1862 self.patch.draw(renderer)
-> 1863 mimage._draw_list_compositing_images(
1864 renderer, self, artists, self.suppressComposite)
1865

c:\program files\python38\lib\site-packages\matplotlib\image.py in _draw_list_compositing_images(renderer, parent, artists, suppress_composite)
129 if not_composite or not has_images:
130 for a in artists:
--> 131 a.draw(renderer)
132 else:
133 # Composite any adjacent images together

c:\program files\python38\lib\site-packages\matplotlib\artist.py in draw_wrapper(artist, renderer, *args, **kwargs)
39 renderer.start_filter()
40
---> 41 return draw(artist, renderer, *args, **kwargs)
42 finally:
43 if artist.get_agg_filter() is not None:

c:\program files\python38\lib\site-packages\matplotlib\cbook\deprecation.py in wrapper(*inner_args, **inner_kwargs)
409 else deprecation_addendum,
410 **kwargs)
--> 411 return func(*inner_args, **inner_kwargs)
412
413 return wrapper

c:\program files\python38\lib\site-packages\matplotlib\axes_base.py in draw(self, renderer, inframe)
2745 renderer.stop_rasterizing()
2746
-> 2747 mimage._draw_list_compositing_images(renderer, self, artists)
2748
2749 renderer.close_group('axes')

c:\program files\python38\lib\site-packages\matplotlib\image.py in _draw_list_compositing_images(renderer, parent, artists, suppress_composite)
129 if not_composite or not has_images:
130 for a in artists:
--> 131 a.draw(renderer)
132 else:
133 # Composite any adjacent images together

c:\program files\python38\lib\site-packages\matplotlib\artist.py in draw_wrapper(artist, renderer, *args, **kwargs)
39 renderer.start_filter()
40
---> 41 return draw(artist, renderer, *args, **kwargs)
42 finally:
43 if artist.get_agg_filter() is not None:

c:\program files\python38\lib\site-packages\matplotlib\axis.py in draw(self, renderer, *args, **kwargs)
1176 self._update_label_position(renderer)
1177
-> 1178 self.label.draw(renderer)
1179
1180 self._update_offset_text_position(ticklabelBoxes, ticklabelBoxes2)

c:\program files\python38\lib\site-packages\matplotlib\artist.py in draw_wrapper(artist, renderer, *args, **kwargs)
39 renderer.start_filter()
40
---> 41 return draw(artist, renderer, *args, **kwargs)
42 finally:
43 if artist.get_agg_filter() is not None:

c:\program files\python38\lib\site-packages\matplotlib\text.py in draw(self, renderer)
697
698 gc = renderer.new_gc()
--> 699 gc.set_foreground(textobj.get_color())
700 gc.set_alpha(textobj.get_alpha())
701 gc.set_url(textobj._url)

c:\program files\python38\lib\site-packages\matplotlib\backend_bases.py in set_foreground(self, fg, isRGBA)
953 self._rgb = fg
954 else:
--> 955 self._rgb = colors.to_rgba(fg)
956
957 def set_joinstyle(self, js):

c:\program files\python38\lib\site-packages\matplotlib\colors.py in to_rgba(c, alpha)
187 rgba = None
188 if rgba is None: # Suppress exception chaining of cache lookup failure.
--> 189 rgba = _to_rgba_no_colorcycle(c, alpha)
190 try:
191 _colors_full_map.cache[c, alpha] = rgba

c:\program files\python38\lib\site-packages\matplotlib\colors.py in _to_rgba_no_colorcycle(c, alpha)
258 f"Value must be within 0-1 range")
259 return c, c, c, alpha if alpha is not None else 1.
--> 260 raise ValueError(f"Invalid RGBA argument: {orig_c!r}")
261 # tuple color.
262 if not np.iterable(c):

ValueError: Invalid RGBA argument: 'G'

# If applicable, paste the console output here
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Expected outcome

Matplotlib version

• Operating system: windows 10
• Matplotlib version (import matplotlib; print(matplotlib.__version__)): 3.3.2
• Matplotlib backend (print(matplotlib.get_backend())): Qt5Agg
• Python version: 3.8.3
• Jupyter version (if applicable):
• Other libraries: