ISSUE-2346: Last Call Comment: previous discussion about filterRes

Last Call Comment: previous discussion about filterRes

State:

RAISED

Product:

SVG 1.1 F2 Last Call

Raised by:

Erik Dahlström

Opened on:

2010-06-29

Description:

I think, the previous discussion about filterRes could be reflected
within the related section, for example as an informative addition.

Previous discussion:
http://lists.w3.org/Archives/Public/www-svg/2009Jul/0014.html
http://lists.w3.org/Archives/Public/www-svg/2009Jul/0017.html
http://lists.w3.org/Archives/Public/www-svg/2009Jul/0020.html
http://lists.w3.org/Archives/Public/www-svg/2009Jul/0029.html

Summary:
a) Problem with float numbers and rounding in implementations

Suggestion:
Note, that behaviour for float numbers is undefined,
therefore authors should use only integers.
Note furthermore, that this might cause implementation dependent
behaviour for continuous animation, in doubt authors have to
use discrete animation providing all intended values manually.

Alternatively define the behaviour for float numbers.

b) To which value in pixels results the mentioned 'default' of 400dpi?
What does 'current display's pixel resolution' mean?
For example, if the filter region is related to an area of 1000px x 600px
device pixels, is the related value '1000 600'?
Or does it mean for the same device with a display of 1600px x 1200px
a value of '1600 1200'?

Suggestion:
Explain how to derive the required number value
for filterRes from the mentioned '400dpi default'.

Alternatively avoid to mention units for an attribute value,
that can only contain numbers.

Provide an example for a device display and a filter region
as mentioned.

Original mail:
http://lists.w3.org/Archives/Public/www-svg/2010Jun/0202.html

Related Actions Items:

• ACTION-2908 on Erik Dahlström to Investigate ISSUE-2346 - due 2010-11-25, closed

Related emails:

1. SVG/profiles/1.1F2/DoC disco.xsl,1.4,1.5 dump.html,1.3,1.4 (from cvsmail@w3.org on 2011-05-04)
2. Re: {minutes} 9 December 2010 SVG WG telcon (from chris@w3.org on 2010-12-10)
3. Re: [SVG1.1F2 LC] previous discussion about filterRes (from Dr.O.Hoffmann@gmx.de on 2010-12-08)
4. Re: [SVG1.1F2 LC] previous discussion about filterRes (from ed@opera.com on 2010-12-08)
5. SVG/profiles/1.1F2/master filters.html,1.37,1.38 (from cvsmail@w3.org on 2010-12-08)
6. SVG WG Minutes December 2, 2010 (from patd@microsoft.com on 2010-12-02)
7. Research on ISSUE-2346 (from ed@opera.com on 2010-11-29)
8. status update (from cam@mcc.id.au on 2010-11-25)
9. Agenda Nov 18 2010 SVG WG telcon (from ed@opera.com on 2010-11-17)
10. SVG/profiles/1.1F2/DoC getxml.html,NONE,1.1 disco.xsl,1.3,1.4 dump.html,1.2,1.3 dump.xml,1.1,NONE (from cvsmail@w3.org on 2010-08-02)
11. SVG/profiles/1.1F2/DoC disco.xsl,1.2,1.3 dump.html,1.1,1.2 (from cvsmail@w3.org on 2010-07-29)
12. Minutes July 6 2010 SVG WG telcon (from anthony.grasso@cisra.canon.com.au on 2010-07-07)
13. ISSUE-2346: previous discussion about filterRes [SVG 1.1 F2 Last Call] (from sysbot+tracker@w3.org on 2010-06-29)

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