Re: [office-comment] draw:extrusion-first-light-harsh (ODF all versions)

[robert_weir@us.ibm.com]

I think that's the point.  Computer graphics got the name and concept from 
photography which got it from painting, and painters got it from observing 
life.  The concept of soft versus harsh light has been around since at 
least Caravaggio (1571-1610). This is not a term specific to computer 
graphics.  It is a general term referring to scene lighting and we use it 
in its ordinary sense. 

-Rob

Bob Jolliffe <bobjolliffe@gmail.com> wrote on 04/24/2009 09:17:31 AM:

> 
> Re: [office-comment] draw:extrusion-first-light-harsh (ODF all versions)
> 
> Following one of those links on Google books search I found this 
definition:
> 
> ".. harsh lighting may be said to be that where the shadows are so
> black that all detail therein is obscured ... "
> Journal of criminal law and criminology: official organ of the
> American Institute of Criminal Law and Criminology
> By Northwestern University (Evanston, Ill.). School of Law, American
> Institute of Criminal Law and Criminology, JSTOR (Organization)
> Published by Northwestern University Press, 1938
> Item notes: v. 29
> 
> I don't know if that's the intent of the way we use it, but I do like
> the conciseness of the description.  I could implement that.  Even if
> it does pre-date the domain of computer graphics.
> 
> Cheers
> Bob
> 
> 2009/4/24 Florian Reuter <freuter@novell.com>:
> > But I bet its not used in the domain of Computer Graphics since 1895. 
So
> > could you please explain how a "A search of Google books" since 1895
> > helps implementors implementing the attribute in question?
> >
> > ~Florian
> >
> >
> > robert_weir@us.ibm.com wrote:
> >> A search of Google books shows that the term "harsh lighting" has 
been in
> >> constant use since at least 1895, with the same sense with which we 
use it
> >> today.  I would take this as being sufficient evidence of the term 
being
> >> commonly known.
> >>
> >> 
http://books.google.com/books?q=%22harsh+lighting%22&btnG=Search+Books
> >>
> >> -Rob
> >>
> >>
> >>
> >> From:
> >> Patrick Durusau <patrick@durusau.net>
> >> To:
> >> Alex Brown <alexb@griffinbrown.co.uk>
> >> Cc:
> >> office-comment@lists.oasis-open.org
> >> Date:
> >> 04/24/2009 07:30 AM
> >> Subject:
> >> Re: [office-comment] draw:extrusion-first-light-harsh (ODF all 
versions)
> >>
> >>
> >>
> >> Alex,
> >>
> >> Alex Brown wrote:
> >>> 18.162:
> >>>
> >>> ----b
> >>> The draw:extrusion-first-light-harsh attribute specifies if the 
first
> >>> light is harsh.
> >>> ----e
> >>>
> >>> It's almost poetic, but I'm not sure a clean-room developer is going 
to
> >>> be able to implement it.
> >>>
> >>> Please define what constitutes "harsh" light.
> >>>
> >>>
> >> This raises an interesting question, your other comments are 
noteworthy
> >> as well but this one is particularly so.
> >>
> >> I draw you attention to Annex D of Part 2 of the ISO/IEC Guidelines
> >> which reads in part:
> >>
> >>> Any term which is not self-explanatory or commonly known and which 
can
> >>> be differently
> >>> interpreted in different contexts shall be clarified by defining the
> >>> relevant concept.
> >> In this particular context, the question is to who would the 
definition
> >> of "harsh" lighting be commonly known?
> >>
> >> I certainly don't know what it means but then I am not the sort of
> >> person who would be implementing the graphics portion of ODF 1.2.
> >>
> >> The term "harsh" does not appear in "Computer Graphics: Principles 
and
> >> Practice" Second Edition in C by Foley, et. al., but I cite for your
> >> amusement a Photoshop tutorial that purports to be about "harsh"
> >> lighting: http://www.rnel.net/tutorial/Photoshop/8263.
> >>
> >> Personally I don't think I know any more about "harsh" lighting after
> >> reading the "tutorial" other than it is "commonly seen in urban 
portrait
> >> or fashion photography." I am not sure that would be a helpful
> >> definition. ;-)
> >>
> >> There are standards, X3D comes to mind, that have lighting definition
> >> systems. See www.web3d.org.
> >>
> >> All of this is to suggest that perhaps the term "harsh" lighting has 
a
> >> common interpretation in the graphic community that isn't known to 
those
> >> of us more at home in the markup community.
> >>
> >> Speaking strictly for myself personally, I am hopeful that in a 
future
> >> release ODF will adopt by reference the current version of X3D. One 
of
> >> the hallmarks of standards (at least to me), being their use of other
> >> standards.
> >>
> >> Hope you are looking forward to a great weekend!
> >>
> >> Patrick
> >>
> >
> >
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