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I haven't quite figured out all the things one could do with imagemagick, but a couple things I use are
-filter Lanczos - I "think" this gets you better quality on resizing but not sure)
-gamma # - like brightening but in some cases a bit better
-sharpen # - to sharpen it up
-quality is just the compression quality for saving to jpg
I've been using "composite" to build thumbs with text on them in bulk and it may be possible to do some other things.. for example, make a copy of the thumb, blur it out and then layer it on top with an opacity. Haven't investigated that yet though
haven't played with these yet
-contrast
-level
-modulate
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