[REBOL] Re: Display device DPI
From: brett:codeconscious at: 22-Oct-2002 18:58
Hi Ashley,
> Open a word-processor of your choice and insert this image. Look at the
> properties of the image and note the dimensions (usually given in cm's or
> inches). Do the same thing on an alternate display device (eg. an LCD) and
> note how the same image has different dimensions. Changing the printer or
> screen resolution does not effect this, it seems to be a property of the
> display device itself (dot pitch?). The practical consequence of this is
> that the above image saved (using one type of display device) will appear
> pixelated on another. I found this out the hard way after comparing
> documentation (screen-shots) written on a 17" CRT (at 1024x768) and viewed
> on a 15" LCD (also at 1024x768).
I have access to a desktop with CRT and a laptop but I could not replicate
the problem. Still how the Word processor arrives at a conversion of 100
pixels to 2.65cm (for me) is a good question.
I'm guessing that a Windows API call is necessary to find the device units.
What happens on Linux I don't know.
For Windows, something around here may help you:
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/gdi/devcons
_88s3.asp?frame=true
EEK! :^)
Regards,
Brett.
