in laravel if and ifelse not switching perfectly

i am trying to displaying image in view with if and ifelse,

my code showing image but it every time chancing height="70" width="70" size ,

@if (File::exists($view_and_download->digital_signature_image == 'Digital-right-mark.png'))
    <div class="digital_right_png" ><img  height="70" width="70"   src="CERTIFICATE_AND_HARD_COPY_FILE/"> </div>


@else 
    <div class="digital_signature_png" ><img  height="30" width="100"   src="CERTIFICATE_AND_HARD_COPY_FILE/"> </div>


@endif

via Chebli Mohamed