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DPI
DPI (an abbrevation for "Dots Per Inch")
is a measure of resolution
in bitmaps,
and bitmapped-devices (for example, screen displays and printers).
DPI measures the number of pixels
for every inch of display/print-out. The higher the DPI,
the better the quality of the results.
- Screen displays usually are fairly low
resolution devices,
and typical DPIs are often as low as 72 DPI, or 90 DPI.
- Low resolution is often much more obvious in printed documents,
so these are usually prepared at a higher DPI. Typical home/office often
printers
have a resolution of 300 DPI to 600 DPI. Professional quality printers
(used for magazines, etc.),
usually have higher resolutions, and arund 1500 DPI is typical.
If you send a low resolution
bitmap to a higher resolution device,
one of there are two possible consequences:
- The
bitmap can be kept (not scaled)
at same number pixel size, in which
case it will appear very small on the output medium.
For example:
Imagine you have a 300 by 300 pixel
bitmap.
- If you display this
bitmap
on a 90 DPI screen display,
without scaling, it will appear 3.33 inches by 3.33 inches on the screen
(because 300 / 90 = 3.33).
- If you print this
bitmap
on a 600 DPI printer, it will appear 0.5 inches by 0.5 inches on the paper
(because 300 / 600 = 0.5).
- The
bitmap can be scaled up to keep the
same physical size (in inches)
by increasing the pixel size, in which
case jaggies will appear.
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