Logo Size incorrect in Backend?

Hi,

are the dimensions of the logo in the backend realy right? 340px * 156px
cause if i check this with firebug i get something about:

element.style {
    max-height: 116px;
    max-width: 211px;
    width: auto;
}

and if i upload the logo in that dimensions i get a sharp clean logo.

thank you for your help.
regards
jens