The supported logo formats are: JPG, JPEG, PNG, and BMP. The recommended size is: 340px x 92px.
To change the logo displayed on the login screen of the terminal, in the Terminal personalization section:
Click +Add next to Custom Logo and click Choose file. The Choose File to Upload dialog window appears.
In the dialog window, select the file with the logo and click Open. The Choose file button on the Personalization tab will be replaced with the name of the logo file.
Click Save to confirm the change. The logo is now displayed on the Personalization tab. You are asked to restart the terminal.
In the Apply new settings pop-up, keep the Reset all terminals option selected and click OK . The new logo is uploaded to the terminal.