edit psd file programmaticaly without open editor

[fabricia77]

Is there a way in gimp or other that give me the possibility to edit a PSD file without using and graphic editor and without human interaction ?


For example:

I have a psd file. I want to be able to do this only with a script:

• open psd file
  
  
• find a specific layer
  
  
• replace this layer with a new layer. The new layer is obtained from a specific image
  
  
• save the new psd documents
  
  
• export the result to pdf file