Does Polish or WebP compression make black dark gray?

I recently started using Polish (Lossy) with WebP enabled and I have started to notice many of the images that are straight black with a white background (think clipart) have the black look more dark gray than black. These are images that have been on my site for years so I would assume it has something to do with this setting but not sure why or if it’s the WebP or Polish/Lossy setting enabled. Anyone know why this is happening?

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