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Your browser doesn't supporting Javascript, please enable javascript and then refresh this page. Please move that box or resize it by dragging its edges to select desired part of an image. When you're printing something, the "dots" are the dots of ink (or similar material) that the printer puts on the paper (or similar medium). When you're taking a picture with a digital camera or using a scanner, the "dots" are single-color pixels ("picture elements") that are created by analyzing the image.
That is the most important point here, so it's worth repeating: There is no "inch" of digital data. Technically, you could measure the physical space used on the magnetic platter of a hard disk, but it would vary per disk. The only correct way to refer to the size of a photo in terms of "dots" alone, without also referencing inches, is by describing the pixel dimensions, such as 640x480, 1024x768, etc.
DPI is determined by dividing dots (for a digital image on disk this is just pixels) by inches. If you don't believe it and think this is some sort of trickery, try it yourself -- create your own.
The time-based measurements only make sense when you're talking about travel between the two points.
Similarly, using dots per inch to describe a digital photo only makes sense in certain situations like printing, scanning, etc.
There are many ways that a computer can "compress" a digital photo to keep it looking the same (or almost the same) while reducing how much disk storage is used for the photo. Another way to manage the amount of data (file size) for a digital photo is to manage how much color information is stored for each pixel.
Maybe this was true back in the days of green- or amber-screen terminals used with mainframes.
If somebody tells you that a computer monitor is set to 72 DPI, tell them you're waiting for them in the 21st Century!
Image editing software, such as Corel PaintShop Pro X7 Ultimate, will let you adjust the DPI settings of an image, but this can lead to confusion (and some software is worse than others about being confusing).

Make avatars and post them to Tumblr, MySpace, Hi5, Facebook, eBay, Orkut, Bebo, Xanga, QQ, Friendster, etc. You can browse all the images on your computer, chose one from the list, upload it, select the size and area you want to use and then click ‘Create Avatar’ and it will be ready to use on whichever website or social media you wish.
The myth is that "DPI" makes sense for digital photos stored or being transferred in a computer-readable format where there are no inches.
Even that much is not possible when you're talking about storing a photo on a memory card, sending a photo as an email attachment, uploading a photo to a Web site, etc. If you want to know the real distance, the only sensible measurement is in miles (or kilometers, etc.).
In a 640x480 image, there are 307,200 pixels (multiply 640 by 480, just as you would find how many squares are on a piece of graph paper without counting each one). Some of those ways preserve the photo exactly ("lossless") and some of those ways actually throw away parts of the photo that are "less necessary" than other parts ("lossy"). If you use just a 0 or 1 to describe each pixel, you won't need much disk space, but each pixel can only be one of two colors (typically black or white). If you look at the dot-pitch specs for modern monitors, you'll see that they have many more display "dots" per inch than 72, and the "dots" do not match up with the pixels in your photo. First is the amount of disk storage needed, and second is the pixel dimensions (width and height). You can also use the package to resize image or crop images and save them – a great tool in one place. However, if you make changes (as was done with the images above to make them more interesting to look at), you must make identical changes to both images, and be careful to avoid other differences such as file types, compression settings, etc. If you are talking about image size as it is stored on disk, posted to a Web site, submitted electronically to a contest, or sent via email, there is no physical inch and therefore DPI makes no sense. DPI does affect file size when you're dealing with physical inches -- printing, scanning, etc. If you alter the compression of your photo (while being wary of your image being ruined by too much "lossy" compression), you can manage the disk storage requirements. This doesn't give you what most photographers think of as a "black & white" photo, since that requires shades of gray.

Modern displays have flexible settings for the pixel dimensions they show, but this does not affect the actual dots used to display images. Many people thought the world was flat, and many thought that Earth was the center of the universe.
Neither of them use inches, so DPI (dots per inch) can't describe a digital photo's size on a computer. Over twice as many pixels means over twice as much data, so an uncompressed image (assuming identical color depth) will be over twice as big in terms of disk space. If you use every number between 0 and 255 to describe each pixel, you can have up to 256 colors (or 256 shades of gray). Dots per inch only makes sense when printing, scanning, or other situations that have a physical component. DPI may be a "simple" acronym for "dots per inch" but what it really means depends on what "dots" are involved.
If, however, you want to know how long it takes to travel, then all of the time-related "measurements" make sense, even though they're different, because each is for a different scenario (non-stop driving, driving with stops, and flying, respectively).
However, those bigger numbers require more disk space, due to the way computers handle numbers. If you then reset the monitor to show 1024x768 pixels, it will show many more pixels per inch, but, again, it's still a .27mm dot-pitch monitor.
As mentioned above, DPI describes the function of a device, not the size of a digital photo. In other words, the "dots" in one situation are not the same as "dots" in another situation. Many images use over 16 million colors per pixel, to give you a more natural image, and that means each pixel requires even more disk storage.
This has no effect on the number of pixels in the photo, it just relates to how much information is stored about each one of those pixels.

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