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

Patrick hi 

> In this particular context, the question is to who would the 
> definition of "harsh" lighting be commonly known?


But "harsh" could mean very bright, or causing a very contrasty effect,
or strongly directional, or having a flourescent white balance, or ...
it is simply not a sufficiently precise term for a technical
> 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. ;-)

True. As it happens I spent several years doing nothing much but
graphics programming (before XML was even invented), so this is a
technical domain I have some knowledge of -- and partly why this wording
caught my eye.

The UK raised a similar kind defect for DIS 29500 about the
ST_PresetMaterialType datatype, which defined materials like "metal",
"powder" and "plastic" for specifying the appearance of 3D rendered
shapes. Yes, of course we all know what "metal" surfaces look like -
sort of - but this is not sufficiently precise for a technical spec.
Consequently, Ecma had to revise the text to specify for these surfaces
their specular color, ambient color, etc. (must check this in ODF).

There must be something you can specify about this? (Actually, maybe
not, since I suspect in fact harshness is a property of relected light,
not of a light source: the same light reflecting harshly off a concrete
surface would not be harsh shining on a grassy meadow -- this is also
why we in this thread are referring to harshness as a property of
renditions: paintings of certain styles and high-contrast photographic
prints, e.g.)
> 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.

Right, so some guys will be on hand (who have developed ODF
applications) able to articulate what this is - have them do it!
- Alex.

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