How can you make normal maps / bump maps?

posted to: Using Normal Maps

The question is that simple... What are the steps to create normal maps or bump maps? Could you provide a detailed guide or recommend any resources?

Also... Between Blender and Photoshop, which software is more efficient for creating normal maps or bump maps? Is it even  possible to make a map in Photoshop? Could you share your experiences or insights? (Sorry for the avalanche of questions)

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