There is no direct conversion. For a monitor, right click on your desktop
and in the properties look at the monitor settings. Lets say your monitor
is set for a screen resolution is 800x600. Divide those numbers by the
width and height of your monitor in cm and you've got the conversion for a
full screen image on your computer. But printed images are a little more
complicated - there you deal with a dots per inch or dots per cm variable
and an image of any pixel dimensions can be set to any desired resolution,
hence any desired size. Let's say I've got a picture shot with an
inexpensive digital camera that is a jpg file measuring 1024x768 pixels. In
Photoshop I can set it so the resolution is 150 dpi (60 px/cm) and it will
print as a 12 x 17cm picture or I can set it to 120 px/cm and it will print
as about 6.4 x 8.5 cm picture. FYI, the generally used resolution for high
qualitity printed images intended for display on the wall is 300 dpi
although you can go up to your full printer resolution if you wish for even
higher quality at a sacrifice of image size, ordinary snapshots usually
about 150 dpi, while pictures intended for onscreen viewing and web sites
are usually set about 60-75 dpi (30 px/cm) as most monitor setups typically
fall in that ballpark.
That being said, you really should post such questions in a group
specifically for digital imaging and the software you're using. This group
is specifically for issues regarding project managment and the MS Project
software. Glad to help out with this one though because some of my other
interests aside from project managment include video production and
photography.
