Remove Magento demo store image from printed order confirmation
Here’s one that catches a few out now and then – when setting up and configuring your new Magento installation remember to test everything! Do a test order and notice, if you haven’t edited it out, you have a link to print this order. This works out of the box and formats properly but the default has the Magento demo store logo.
To change this you need to replace the default file in skin/frontend/default/default/images/logo_print.gif
skin/frontend/default/yourwebsite/images/ and so on.
If in doubt, right click on the offending image, inspect element and you should see the correct location and file name.
The image is 157×47 and has to remain that size unless you want to start playing with other stuff or losing visibility of your image.