Image comparison on SVGs is not consistent

[Sybsw]

While running comparisons locally and in docker and drone, I am seeing an animated svg always being different to a varying degree. Upping the threshold gets round the problem but is not ideal.

We ran locally with headless disable to check if the image was actually frozen so I would doubt that is the cause in docker/drone. It seems to be an issue of rendering the pixels a little differently each time.