Question about Epson Stylus CX4700 All-In-One InkJet Printer
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?
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
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Posted on Jan 02, 2017
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