If your PC is set to more than 100% dpi, then you may face scaling issues with the images in your email signatures in Outlook. The images may look smaller in the email signature.
Resolution
Uploading the email signature from Outlook on Windows to Xink will fix the issue - Learn how.
Alternatively, when you create a new template using the built-in designer:
To fix the size of your images in Outlook, open your signature in Xink, and click "Source":
Then copy/paste the below code at the top of your signature, and save:
<!--[if gte mso 9]> <xml> <o:OfficeDocumentSettings> <o:AllowPNG/> <o:PixelsPerInch>96</o:PixelsPerInch> </o:OfficeDocumentSettings> </xml> <![endif]-->