The default is to estimate the image quality or use 92 if it cannot 
make a good estimate. Therefore, below, you have estimated quality in 
the first and used quality=100 in the second.

Also you will be more efficient if you use -strip right after the 
input, so those things don't get passed to the resized image. 
Moreover, you will be even more efficient if you use -thumbnail 
rather than -strip and -resize.



>To me it would make
>sense that the following 2 commands produce the same result:
>
>convert jensen.jpg -resize 600 -strip jensen-s600-strip-q100.jpg  (by
>ignoring quality isn't 100% assumed?)
>convert jensen.jpg -resize 600 -quality 100 -strip
>jensen-s600-strip-q100.jpg
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