Package: paraview Followup-For: Bug #894462 The png generated by the procedure in this bug looks fine to me, using current paraview (5.11). It's slightly blurry but no more than you'd expect for a png file (it's raster image format, not a vector image format, you can't expect to main high resolution if you zoom into the pixels).
Can you confirm paraview 5.11 is meeting your image quality expectations? As far as I can tell, we can close this bug now.