Yes, convert has an -antialias switch, but not
GhostScript — at least not the jpeg driver (there's an
x11alpha screen driver, but I think that's the only one which
does anti-aliasing by itself). And ImageMagick (i.e. convert)
cannot render PDF/PS itself; it uses GhostScript for that under the hood,
Personally, I prefer to use both tools separately, because then I
have fine control over the parameters used during conversion, and so
far, I've always achieved better results (in less time) than when
trying to convince convert alone to do what I want.
For example, the naive approach (which I figure should be
comparable to the conversions I posted above) when using convert directly
would be something like this:
$ convert input.pdf -density 150 -geometry 1240x1754 -antialias -quali
+ty 90 img%d.jpg
But the results are much worse than when doing the steps separately...
(example: test1.jpg, test2.jpg — where test1.jpg has been
produced by using gs and convert separately, and test2.jpg
when calling gs indirectly via convert (the command right above)).
As I read the docs, -density is supposed to set the
resolution ("set resolution of an image for rendering to devices"),
however, for some reason this doesn't seem to be passed on to
Ghostscript (as can be revealed using strace)... In case
you have the patience to figure out the correct incantation of options for
convert that achieves the quality of test1.jpg, please
let me know (input PDF here)
— IMHO, there's too much Magick going on :)
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