Is it Mysql bug?

hi,
I have a vbulletin database file, it contains inside it a lot of images and another information, it size is around 490M. when i use the command [[ mysql -uusername -ppassword dbname< filename.sql]] to load the file to mysql program, the size decrease to around 320M Is it Mysql bug? . after that when i see the images in the forum i find all images being not clear. ((see the file it contain one of them))

why is that? Is it mysql Bug? Is it Mysql bug?
i have search in google about this problem but i did not any similar problem. Is it Mysql bug?

 

 

 

 

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