try this also

convert -define jpeg:size=420x420 source.jpg -thumbnail 140x93! 
-quality 75 +level 30x100% -sharpen 0x1.5 source_proc7.jpg

convert -define jpeg:size=420x420 source.jpg -thumbnail 140x93! 
-quality 75 +level 25x100% -sharpen 0x1.5 source_proc8.jpg


Fred
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