Try using the "chf" parameter <https://google-developers.appspot.com/chart/image/docs/chart_params#gcharts_solid_fills>. The color string supports appending two hex digits to the end for alpha:
chf=bg,s,8360c7a0 On Thursday, August 7, 2014 5:43:20 PM UTC-4, Laurent wrote: > > Nobody knows how to get a transparent chart background ? > -- You received this message because you are subscribed to the Google Groups "Google Visualization API" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected]. Visit this group at http://groups.google.com/group/google-visualization-api. For more options, visit https://groups.google.com/d/optout.
