[Gimp-user] Sizes of an image - display v printing

When you look at your picture at 100% in Gimp, Paint and other
applications, it is displayed "dot for dot", one pixel of the picture
one pixel on your screen, and therefore it is displayed using your
screen definition (so given the size you report we can assume that the
resolution of your display is 828/(23/2.54)=91 pixels/inch).

On the other hand your picture has an embedded "print definition"
is used for printing, in your case 828/(3.5/2.54)=600 pixels/inch.
sets a theoretical size for the picture, size at which the picture is
printed (as long as everything in the print stack abides to it).

Print definition (in Pixels/inch), print size (in inches) and size (in
pixels) are related by the formula:

print size = print definition * pixels

Note that this means that you can only pick two of these values, the
third is determined by the first two.

In Gimp you can un-tick "View>Dot for dot", in which case the picture
will be shown at the print size, if your screen resolution is properly
set (see Edit>Preferences>Interface>Display).

When you create the image, you should set the size in pixels big
so that you can print it at the required size with a print definition
at least 200 pixels/inch (photo) preferably 300 or more if there is
text/logos or other computer-generated graphics. The advanced options
"File>New..." let you enter a print size and print definition, and
compute the required size in pixels.

Reducing the DPI from 600 to 200 made a big difference for dragging the image
into an email. Thank you.

chuckie (via www.gimpusers.com/forums)

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