Question about Epson Stylus CX4700 All-In-One InkJet Printer

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Images scan set at 300 dpi, end up 72 dpi

Have a friend with one of these scanners on the other side of the country. He says that he is scanning images at 300 dpi, but when he sends them to me, they are 72 dpi. Any idea why this could be happening?

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  • kellerwerks Nov 14, 2009

    Thanks. According to the recipe given above - I have one image with a pixel width of 549, and a physical width of 7.625. Divide 549 by 7.625 and you get 72. So it looks like the image was indeed scanned at 72 dpi, and we can't seem to figure out why. Back at square one. :/

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It depends on the physical size of the images. Size and resolution are related to each other. Let me explain:
You have an original, say, 2 inches by 2 inches.
You scan it with resolution of 300dpi (dots per inch).
You will get a file that's 600 by 600 pixels, right?
Then you look at it on screen, which has a resolution of 72dpi - if it's displayed without magnification, what size the picture will be? 600 divided by 72 = 8 and 1/3 of an inch, so on screen it will be 8 1/3 by 8 1/3 inches.

So, there's no such thing as a picture file's "real" resolution - we can talk about a resolution at a given size, because it's the horizontal and vertical size in pixels what's "real".

Therefore you have to ask what size the scanned picture is, and then look at the file you receive; in it's properties you will find it's number of pixels horizontally and vertically, and from that you can easily calculate (dividing the height in pixels by the height in inches) the actual resolution the file has been scanned at.
Then you'll know for sure if need to complain to the friend ot not :)

Posted on Nov 14, 2009

  • Stan
    Stan Nov 14, 2009

    I would suggest checking the following:
    1) If your friend is using a scan to e-mail function, it may override the default resolution and always scan with the screen resolution. Le the friend try scanning to file and checking the file locally on his computer to make sure, that it's really 300dpi (in the example you gave it would mean a width of ~2285 pixels). If it's OK then send it as an attachment.
    2) If the picture is indeed 300dpi (checked as above), but still arrives as 72dpi, then your email client/interface is to blame; it must scale down the picture automatically (for example Outlook likes to do that; it usually asks how to scale it, but it's possible to make a choice a default and forget about it).
    To avoid that I would suggest ZIPping the file [for example via rightclick - Send To - Compressed folder (zip)] and sending the zip file as an attachment.
    Good luck :)


  • Stan
    Stan Nov 14, 2009

    I would suggest checking the following:

    1) If your friend is using a scan to e-mail function, it may override
    the default resolution and always scan with the screen resolution. Le
    the friend try scanning to file and checking the file locally on his
    computer to make sure, that it's really 300dpi (in the example you gave
    it would mean a width of ~2285 pixels). If it's OK then send it as an
    attachment.

    2) If the picture is indeed 300dpi (checked as above), but still
    arrives as 72dpi, then your email client/interface is to blame; it must
    scale down the picture automatically (for example Outlook likes to do
    that; it usually asks how to scale it, but it's possible to make a
    choice a default and forget about it).

    To avoid that I would suggest ZIPping the file [for example via
    rightclick - Send To - Compressed folder (zip)] and sending the zip
    file as an attachment.

    Good luck :)

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