Charts in SSRS are pixelated/blurry when in subreport

Question

I've a report that uses a sub-report that contains a line graph.

This is in report manager as sub-report:

This is the same thing exported to PDF. It is somewhat better in PDF:

Here is a very similar report with chart in main report:

And a very clear PDF export of the same:

I've tinkered with the dpiX/dpiY setting for PDF export which do improve the PDF export, but embedded images get shrunk. I've made the sub-report report size exactly the same size as the sub-report control of the parent report and played with explicit sizing as opposed to automatic sizing of the components of the chart.

Any recommendations on how to clear up this pixelation issue.

This is running on SSRS 2016 SP1 CU2.

Answer 1

The solution was to rebuild the chart.