Text on resized images appears jagged

[cmeeren]

Take a look at this page. The text on the three images in the slider appears jagged. When I show the largest image (outside of SLIR) and let Firefox do the resizing, everything is nice and smooth. The full-size originals of the three images in the slider are here, here, and here (resize Firefox window to see how nicely it handles resizing).

[cmeeren]

I figured out that this is caused by SLIR's sharpening, which is not possible to toggle off. Will submit a PR where this is implemented in the same manner as progressive (the p flag).