update Magento Store Logos
Location of Store Logos
There are four different logo types which come standard with every Magento install. This gives you the flexibility of assigning appropriate logos to the different task. The following list tells you where the logos are located and their use.
Website Store Logo:
Used for the frontend of your store.
It’s located in:
your_magento_install/ skin/ frontend/ your_skin/ default/ images/ logo.gif
Email Logo for Email templates:
For automated emails to your customer’s.
It’s located in:
your_magento_install/ skin/ frontend/ your_skin/ default/ images/ logo_email.gif
Print logo version vs screen website logo version:
Used when you print a webpage.
It’s located in:
your_magento_install/ skin/ frontend/ your_skin/ default/ images/ logo_print.gif
==========================================
HTML Invoice and Packing Slip logo:
For printing html version.
It’s located in:
your_magento_install/ media/ sales/ store/ logo_html/ default/
You can upload or update this image on your backend here:
System > Sales > Invoice and Packing Slip Design
PDF Invoice and Packing Slip logo:
For printing pdf version.
It’s located in:
your_magento_install/ media/ sales/ store/ logo/ default/
You can upload or update this image on your backend here:
System > Sales > Invoice and Packing Slip Design
Configuring the Store Logos
{1stowebsite note:
it will use default logo if you do not change Invoice and Packing Slip logo
}
When updating or uploading these logos, make sure you use the correct size as shown here in this Magento version 1.2 (200×50). If you don’t use this size, Magento will needlessly distort it to fit 200×50.
from: http://webdevster.com/ecommerce/magento/setting-up-the-logos-in-magento