The problem is that jpgs have been compressed but have millions of 
colors. Try reducing the number of colors for example the image in 
the article you report:

identify sm_img_3455-thumb-210x157-2634.jpg
...17.5KB

convert sm_img_3455-thumb-210x157-2634.jpg -colors 256 +dither 
histogram:sm_image_histogram.gif

identify sm_image_histogram.gif
...16.5KB


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