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Subject: Re: [office] Giving 120%


Andreas J Guelzow wrote:
> "Specifies the proportion of blue RGB color components for a pixel
> graphic object. The defined value range for the draw:blue attribute is
> -100% (no blue) to 100% (full blue)."
> While I can understand that we don't want to discuss every single item,
> shouldn't there be somewhere a common-sense filter?
> If -100% is no blue and 100% is (full blue), what is a value of 0%?
> Since we are using the percentage symbol here it would be nice if there
> were at least some interpretation that this is a percentage of
> proportion of something.
The inexact language was the result of my teasing out what was implied 
in our prior versions.

draw:red, draw:green, draw:blue all control RGB channels. The color of 
any image is set elsewhere and these three attributes represent 
*changes* in the RGB channels for the rendering of that image.

Thus, a setting of -100% for draw:red, allows no input from the red 
channel. A setting of 0%, does not modify the value of the red channel 
for this image. A setting of 100% sets the red channel to maximum.

What confused me was the use of "...*sets* the output of a blue color 
space of a bitmap or raster graphic." Which to me meant that the color 
was determined by this and other attribute. Not so, the color of a 
graphic is *modified* by these attributes.

That is to say that a bitmap or raster graphic starts with a 
defined/set, whatever, RGB space and these three attributes modify that 

Making what seems "obvious" to an author is very hard work and I for one 
deeply appreciate the members of the Sun team and others working towards 
that goal.

Hope you are having a great day!


Patrick Durusau
Chair, V1 - US TAG to JTC 1/SC 34
Convener, JTC 1/SC 34/WG 3 (Topic Maps)
Editor, OpenDocument Format TC (OASIS), Project Editor ISO/IEC 26300
Co-Editor, ISO/IEC 13250-1, 13250-5 (Topic Maps)

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