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Subject: RE: [office] Giving 120%

The only way that I could make sense of this, assuming -100% goes to dark
and +100% goes to full-on, is that the % applies to the range between the
current setting and the extreme.  That is, for the example of a channel
strength of 26 (0x1A), -% takes chunks out of the range 0 to 26, and +% adds
chunks to the range 26 to 255 (assuming the usual RGB values), so -100% is
always 0 and +100% is always 255.

This is a very strange way to do it, but I am not a subject-matter expert on
how filter settings adjust color levels in graphics work.

All this tells me is that we still don't have the full story. 

Is there a JIRA issue on this? 

 - Dennis 

-----Original Message-----
From: Andreas J Guelzow [mailto:aguelzow@math.concordia.ab.ca] 
Sent: Friday, June 26, 2009 08:56
To: office@lists.oasis-open.org
Subject: Re: [office] Giving 120%

On Fri, 2009-06-26 at 05:41 -0400, Patrick Durusau wrote:
> 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.

On second look, this does not make sense. Suppose we are starting of
with a channel strength of 1A for blue, we can then obviously only going
down to 00 which would be -100%. +100% should be 2B. SO we are not
allowing this to be turned up even further? 

If we are allowing -100% we really should at the other end be open (or
at least go to _much_ further.

Andreas J. Guelzow
Concordia University College of Alberta

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