Update output.rst

render_to_png() generates totally black PNG files for some people. This was discussed on Stack Overflow (https://stackoverflow.com/questions/24476029/pygal-rendering-png-svg-black-pictures/25360101#25360101). The proposed solution (tested) is being added to the PNG section of this page.
9 years ago · cf82e593b3
1 changed files with 2 additions and 0 deletions
--- a/docs/documentation/output.rst
+++ b/docs/documentation/output.rst
@ -52,6 +52,8 @@ With cairosvg installed you can directly get the png file using ``render_to_png`
   ...
   chart.render_to_png('/tmp/chart.png')  # Write the chart in the specified file

+In case of rendered image turning up black, installing lxml, tinycss and cssselect should fix the issue.
+

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