Github user agoodm commented on the issue:
https://github.com/apache/zeppelin/pull/1329
@bzz The way I see it the pros and cons of each format can be summed up as
follows:
### SVG
Pros:
- Vector so image quality will be consistent regardless of resolution
- Displays more quickly for simple plots (eg. single line plots)
Cons:
- Very slow for complex plots involving many data points
### PNG
Pros:
- Lightweight regardless of the complexity of the plot
Cons:
- Does not scale to higher resolutions as well due to being raster
- _Slightly_ slower to display simple plots
To be honest, I am not really sure which option would be best to default
to. png is the default format in most matplotlib backends so that is why I have
chosen it for now, but I think it's worth thinking about. Either way though I
don't think the choice of default format will matter in terms of backwards
compatibility as the change should be seamless for users. I am fine with
either option honestly.
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