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error in finding compression ratio

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kash
kash 2012-2-13
编辑： Laura Pop 2013-10-10
i have a code
out=imcompr('dock.jpg',20,'output_image01.bmp');
k=imfinfo('output_image01.bmp');
ib=k.Width*k.Height*k.BitDepth/8;
cb=k.FileSize;
cr=ib/cb
if i change the values of 20 as 50 ,200,2000,i get same value please help

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