Dimension contraints on User Photo

Hello Experts,

I am customizing the properties for "UserPhoto" in System Administration/System configuration/content management/Global Services/UserPhoto.

My requirement is

1) Dimensions should not have any restriction i.e photo with any dimensions should accept.

I tried making it empty, could not solve my problem and moreover it is accepting only the photo with exact dimensions mentioned there.

Could anyone tell me how could i achieve this.

Regards

Sunil Kumar