css - Responsive images using img vs background -

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i've been working on adding animated hover effect , have worked out solution using img , background image can viewed here. background image better read using img better screen readers , search engines per article.

the issue i'm having when testing responsiveness img solution looks warped when compressed col-xs-6 while background solution doesn't. img css using: 

.hovereffect img {   width: 150%;   height: 100%; }

now i've tried using height:auto pic doesn't fill full height, want do. there anyway maintain img proportions when scales down?


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