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Subject: Re: [office] Giving 120%


Just quickly but yes, see Office-1746 draw:blue, 

I haven't entered the latest explanation that I got concerning the 
modification of an existing value.

BTW, 0 - 255 is only one numeric representation of RGB colors, there are 
others. See: http://en.wikipedia.org/wiki/RGB

Not my area either.

Hope you are looking forward to a great weekend!


PS: This was expressed a little better when the color attributes were 
treated together but the relationship between an image and modification 
of its color space was not clearly stated, at least in my opinion.

Dennis E. Hamilton wrote:
> 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 

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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