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Confusion whether the calculated compression ratio is correct or not.

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Nidhi Kumari
Nidhi Kumari 2018-10-11
评论： Walter Roberson 2019-7-30
I am applying compression on an image of 40KB(350x500x3 uint8) to get new image of 18KB(348x500x3 uint8) .I have used the following code for finding the compression ratio-
z='xyz.jpg';
z1='out.jpg';
k=imfinfo(z);
k1=imfinfo(z1);
ib=k.Width*k.Height*k.BitDepth/8;
cb=k1.Width*k1.Height*k1.BitDepth/8;
cr=ib/cb;
The value of cr comes to be 1.005747126436782 .
I don't know whether the value of cr is correct or not.Can anyone verify it? Also i would like to know how it is manually calculated via the formula.
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