Instructions
Press "Windows-Q" to open the Apps screen and then select "Paint" from the list. Open the picture you want to edit and then select "Resize" from the Image group on the Home tab.
Click "Pixels" and then enter into the "Height" and "Width" fields the appropriate dimensions for the resource you want to import. For example, to use the picture as a battle graphic, enter "544" as the width and "296" as the height.
Click "OK" to resize the image to the specified dimensions. Press "Alt-F," point to "Save As" and then choose "PNG Picture" or "JPEG Picture" from the options.
Type a name for the resized photo and then click "Save."