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800 dpi will just barely do it.
Ok, hmm, thank you. Then how does one get a smaller image to used at a larger size at all. Is this not really possible? Sometimes I see vinatge images blown up to very large sizes being used in other collage artists work or even in ads that utilze vintage shots. Is there any methods they are using to get an image large like that without too too much loss in clarity and without pixelation? I do appreciate your ideas and feedback ; )
There are scanners that do 2400 spi, and there are various upscaling apps including Photoshop. You should google the subject.
I just Googled Epson 835 scanner. It appears this is an all-in-one unit (print, scan, fax)
Epson claims much higher scanning resolution, up to 4800 optical and also 9600 interpolated.
However, you don't need to go that high.
Check your Epson scanner software, not sure about your unit, but on regular Epson scanners you can have it scan and upsample at the same time.
Look at Document Size and Target Size. With Target size you can specify a larger output size.
This will take a bit longer to scan, but if this feature is available in your scan driver, this might work for you.
I doubt that your scanner allows for scanning in 16 bit Grayscale, but if it did, you will get more image data to work with in Photoshop.