Recently found this excellent post explaining the SharePoint UserProfile picture sizes and naming convention.

 

Naming convention for the thumbnail files:

Thumbnail Image File Name Size
Large domain_username_LThumb.jpg 144x144
Medium domain_username_MThumb.jpg 96x96
Small domain_username_SThumb.jpg 32x32

The full URL of the medium thumbnail (like, “ http:///User Photos/Profile Pictures/__MThumb.jpg”) is stored in the user profile database.

You can use this information like:

var picUrl = profile[PropertyConstants.PictureUrl].Value as string;
this.imgUser.ImageUrl = picUrl.Replace("_MThumb", "_LThumb"); 

 

 read the full post Photo Management in SharePoint 2010 

 

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