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This is actually a limitation of chrome! The images are perfectly sharp when displayed as files:

The are just up/downscaled to 3em height so the table looks uniform

I'm seeing the same thing in firefox (Linux)

Yes, it's because the images in the PDF are always scaled. I cannot get them to pixel-perfect display in the PDF renderings anyways

The images are the output from the offline renderer, so they are included as PNGs