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> As this image shows, the dithered gradient gets bright way too quickly.

sigh

Not in Firefox on Linux.

I vaguely recall seeing a multi-year-old bug related to subtly broken gamma behavior in either Firefox or Chrome, but can't seem to find it right now.

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Ah, this happens when Firefox/Chrome scales the image. I added a note to the article a couple hours ago, not sure if you saw that.

If you open the image in question in a new tab (to prevent any scaling) you’ll see the image as intended with the “desired” effect.

Are you sure about that ?

The default Ubuntu photo viewer shows it in the same way.

Also, for his second 'improved' dithering, the dithering clearly doesn't correspond to the undithered gradient (both undithered gradients seem to be the same in both pictures ??)