Star Wars poster

[Ofnuts]

• Load the full image that will appear in the text (bottom layer)
  
• Add the image that will be cut through (if you gave it already ready, use File>Open as layers)
  
• Make sure it has an alpha channel: Layer>Transparency>Add alpha channel
  
• Add your text as a layer (text tool or else) or as a path, adjust its position
  
• Make a selection from the text (Layer>Transparency>Alpha to selection if it's a layer)
  
• Select the cut-through layer and Edit>Clear: this will cut a text-shaped hole in the cut-through layer throuhg which wyou will see the image you want in the text.