How do I variety the best-quality copy of color magazine cover?

I'm trying to print copies of covers from our company's 1970s-era annual reports, contained by quality well-mannered enough for framing. I tried our 300dpi color scanner, and next sent the scan to a camera shop's photo printing service. Not good satisfactory. Thanks for your help.

Answer:
The more dpi the clearer your scan for printing but take longer and produces a larger file size.
I would bear it to a professional person close to wolf camera or something i got a poster made of a portrait that be 41"x26" and it looks great
try a bigger resolution

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