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[REBOL] Display device DPI

From: atruter::hih::com::au at: 22-Oct-2002 9:31

I am using REBOL to generate AbiWord documents (it has a nice XML file format and supports embedded base64 PNG's). This works quite well, but embedding a PNG requires you to specify its display height and width in inches and here is where it gets interesting. I have run this on several CRTs and 120 pixels to the inch (DPI) yields a jitter free image. On LCDs the magic number appears to be 96 pixels to the inch. This got me to thinking about the issues this raises: 1) Are these DPIs (120 and 96) representative of all CRT/LCD display devices respectively? 2) Does the OS know this number (the display DPI) and how can I access it? 3) Have others hit this, or a similar, WYSIWYG / scaling issue? 4) Do other file formats (eg. PDF, Word, Open Office, etc) have similar issues (where the image dimensions are given in a unit of measure other than pixels, and a document is generated on one display device and viewed on another)? 5) Am I just approaching this from the wrong POV? Comments? Regards, Ashley