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Actually, most of this depends on the underlying API used for printing, and on the type of printer involved. The Win32 API, for example, uses a virtual resolution equal to the perceived printer resolution; in other words, a 300 DPI printer uses 300 pixels per inch when printing normally from the Win32 API. Mac OS X, OTOH, uses a graphics engine based on PDF, so the imaging standards are much more flexible, and quite a bit more independent of the printer resolution.
As for all the inches/dpi conversion stuff, when printing from Rev, I've just been using the Rev notation:
print <card> from <topLeft> to <rightBottom> into <pageRect>
This means that I just assume the width of the card to equal the width of the paper, then use Rev's tools to automatically scale everything to the right size, regardless of the printer resolution.
Look at the following entries in the docs for some clues:
open printing command print command printPaperSize property
On Mar 11, 2005, at 10:38 AM, <[EMAIL PROTECTED]> wrote:
Len,
I'm a real newbee to programming but work in digital imaging and offer the
following which won't fully answer your question but will hopefully clear a
couple of the clouds...
1.Printerdrivers report resolution changes in DPI settings. This is
tecnically correct -dot per inch
2.Images report resolution as DPI wich is incorrect - it should really be
PPI (pixels per inch)
3.There is not nececarily a mathematical link between PPI and DPI to govern
all printers as each printer driver will use different screens or dither
patterns to achive the dot image, and may not print at 100% 4.Selecting
different printing resolutions in the printer driver will keep the print
size the same as this instruction is interpreted by most drivers as "slow
down the printer and use finer dots, more closely spaced" - blame the
marketing men for that one! At least that means that trial and error will
not be upset by a change in printer "resolution"
Kevin S
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- ----------------------------------------------------------- Frank D. Engel, Jr. <[EMAIL PROTECTED]>
$ ln -s /usr/share/kjvbible /usr/manual
$ true | cat /usr/manual | grep "John 3:16"
John 3:16 For God so loved the world, that he gave his only begotten Son, that whosoever believeth in him should not perish, but have everlasting life.
$
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