Looking at the definition for redact, it sounds as if it specifically applies to text. Can it be used with images and diagrams as well?
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If you don't specify what to redact, a listener might assume you mean to sanitize a document or black out text. There's a strong association with text, but it doesn't mean you can't use the word "redact" with other things.
The current use of redact often includes image redaction, especially when discussing electronic files such as Word or PDF documents.
Adobe PDF tutorials also address this issue with phrases like:
So if you say
you'll be understood.
Note: Redaction has a specific meaning in literature. I'm assuming you're talking about the document sanitization meaning.
The definition of redact:
As you can see, it actually applies to literary works only.
While you might be understood when using it in a different context, it is generally recognized as referring to a process that is only performed on a text.