Andreas,
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
space.
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
--
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)
