I was unsatisfied with the discussion of transparency. You mention to "jump to png", but I just scrolled to the heading and it tells me why jpg is better, in some cases, than png, not how to satisfy turning a png with transparency into a competent jpeg analog.

Of course, if you meant "use the png format" instead of "look at the header", that's likewise unhelpful.

Not sure if there's actually a suggestion in here. I entered the site thinking "if you want a jpg, this is the app". Any question I had about other formats was moot because this is the app for jpgs. But then you discussed the other formats so it seemed like you had some workarounds or ways to use jpgs in place of the other formats, and that left me unsatisfied whereas your saying nothing probably wouldn't have? Again, not sure if there's anything actionable in there, just letting you know my experience with the site.