hi
i want to compress lossless jpeg

regarding to : http://www.imagemagick.org/Usage/formats/#jpg_lossless

i used following command:


convert -quality 100 -compress lossless 1.bmp 1.llj


but i can't see any compression at all, at least the PSNR is lossless. 
I am using Linux and windows 
(on linux i have already tried libjpeg-6b, libjpeg-7 libjpeg-8)

same results at linux and windows.

where is my mistake?
by the way, i did also try with .jpg extension instead of .llj because i
thought libjpeg need that somehow but then the output is lossy.
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