- From: Jon Ferraiolo <jferraio@Adobe.COM>
- Date: Tue, 26 Jun 2001 16:00:52 -0700
- To: Wendell Piez <wapiez@mulberrytech.com>
- Cc: www-svg@w3.org
Wendell, There will be some clarifications in the Proposed Recommendation of the SVG specification in this area. Some clarifications have already been done (by not yet made public), but based on your comments below, I think additional minor cleanup would help reduce confusion. There are really two situations for "px" units: 1) On the outermost 'svg' element, you can define the instrinsic width/height of the graphic in "px" units. In this use case, a "px" is generally an system-dependent unit of measure. On many systems, a "px" will map to one device pixel, and different devices have different resolutions, so "px" might cause different sizes rendering on different systems. Also, on very high-res monitors or on printers, a "px" might be an abstract measurement typically in the range of 1/72 to 1/120 inch, again possibly causes different rendering sizes on different systems. This case is the reason for the words: "...use of px units ... can cause inconsistent visual results on different viewing environments since the size of '1px' may map to a different number of user units on different systems..." But now that you bring this up, I think some additional rewording may be warranted. 2) Otherwise, "A px unit and a user unit are defined to be equivalent in SVG." Jon Ferraiolo SVG Editor jferraio@adobe.com At 03:59 PM 6/26/01 +0100, Wendell Piez wrote: >Hi, > >How do I reconcile the statement in the SVG CR, section 7.10, "Units": > >"A px unit and a user unit are defined to be equivalent in SVG." > >with the statement, below it, that > >"...use of px units ... can cause inconsistent visual results on different >viewing environments since the size of '1px' may map to a different number >of user units on different systems..." > >Is a 'user unit' a px, or ain't it? what am I missing? > >Thanks, >Wendell > > > >====================================================================== >Wendell Piez mailto:wapiez@mulberrytech.com >Mulberry Technologies, Inc. http://www.mulberrytech.com >17 West Jefferson Street Direct Phone: 301/315-9635 >Suite 207 Phone: 301/315-9631 >Rockville, MD 20850 Fax: 301/315-8285 >---------------------------------------------------------------------- > Mulberry Technologies: A Consultancy Specializing in SGML and XML >======================================================================
Received on Tuesday, 26 June 2001 19:01:42 UTC