Re: jpg quality question with imagemagick and Gimp

Fred Weinhaus wrote:
> 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.
>   
216774  jensen.jpg
 75167  jensen-s600.jpg
 35269  jensen-s600-strip.jpg
 29416  jensen-s600-strip-q75.jpg
 35269  jensen-s600.thumb.jpg
 29289  jensen-s600.thumb-q75.jpg

I added 2 more test images to the list. If you care to compare, visit 
www.dottedi.biz/images/im-image_processing_tests. I'll add a 
readme/whatidid doc if anyone requests. And maybe replace the pictures 
later.