: We've had some discussions in the past on this issue. What is the best
: resolution for photos for the web? I'm putting some stuff together for a
: family tree. The software recommended 200 dpi, and this looked fine at work
: on a 19" monitor, but at home (17") it sucks.
: Mind you, the size of the result was much larger than real life.
Resolution is completely meaningless for images displayed on a screen. Only the
dimensions, measured in pixels, count. Resolution is important for scanners (the
higher the resolution, the more details can be made visible) and for printers,
where you use the resolution to set exact dimensions.
With film scanners, you always scan at the highest possible resolution, then
resize the image if the screen is the target. With flatbed scanners a resolution
of 300 DPI is normally good.
Resolution gets real meaning when you want to print at specific sizes. For
instance if you want to duplicate a CD cover. You scan it for instance at 300
DPI and this will be the resolution of the initial image. But your printer will
have a higher resolution, for instance 720 DPI. This means you have to adjust
two things: first you change the resolution to the resolution of the printer
(720 DPI), then you change the dimensions of the image to the original
dimensions (measured in cm or inches). Now you can be sure the print will be
life size and will fit exactly inside a CD jewel case.
For screen based images resolution is just a tag, or comment, in the graphic
file. For instance in PhotoImpact you can change the resolution of a TIFF file
and save it, and notice that neither the dimensions nor file size has changed.
hnz
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