Joshua Hill88 said:Since we're dealing with a document from 1979, the image I mentioned is actually a flag—specifically, the emblem of a former state.
If you're asking about overlaying one image onto another... that's the basics. It's the easiest part regarding whether "
it's even possible to do this?" You just copy and paste.
(To actually process it—meaning "masking" the surroundings of the added image—you'll need some practice.)
I purposely made the image below "complicated." Just to make the process clearer for you.
Basically, below are Image A (left) and Image B (right). Whether there is a house drawn on them, letters, or anything else is irrelevant. Digital images are just data; they are processed according to how computers process images.
- You could simply cover/replace the woman's image with another one and be done with it.
- But let's say the new image is smaller than the woman's photo (or whatever—say, it's "transparent").
- In that case, you first cover the woman's image with a layer that mimics the background of her photo.
- Then, you paste the desired image onto that background imitation.

Regarding what you mentioned under point a)
And yes, it would be ideal if the edit wasn't noticeable, though it isn't strictly critical.

The image above shows a sentence from your post pasted in (using the method described earlier).
Similarly, I have the font used in the
image from the internet, so I typed the sentence in that "original" font. If I didn't have it, a typical example of document editing would probably involve just swapping the positions of two lines...
I don't know what else to add besides repeating this:
...copy, paste, "mask"...
When it comes to digital image processing, believe me, there are no limits.
But...
BUT!!!There is a massive difference between a digital file of a $100 bill (even a high-res master for printing currency) and a photo of that same bill printed on standard paper through a home printer.
The same applies to "old documents." On a screen, it might look like an original document, but once printed, it will only ever look like a photocopy (at least to anyone with common sense, working eyes, and a sense of touch—for instance, printed wrinkles or specific paper textures of vintage documents won't look convincing).