Image compression in Rise

For what it's worth, I've been creating chart images for a module that I'm working on. Originally, the charts were designed in Illustrator and were exported as PNGs. After importing them into Rise, I noticed the big drop in image quality. I have been doing graphic work before using Inkscape and couldn't recall seeing a similar issue, so I exported an SVG from Illustrator, opened it in Inkscape and exported it as a PNG. While there was a bit of a drop in image quality, it was nowhere near as noticeable as when I exported from Illustrator.

Although Inkscape renders the font as being thinner, I made a version with a thicker font to match Illustrator and the compression was still fine. While it would seem the solution is to use Inkscape over Illustrator, there are just some things I can't do in Inkscape and I even had to remove a couple of features/effects from the chart so I could give them an even test in both applications.