Re: [office-comment] Insufficient description of output filter draw:luminance and draw:contrast

[Patrick Durusau <patrick@durusau.net>]

Regina,

Thanks!

Do you have suggestions/pointers to better definitions for luminance 
and/or contrast?

Thanks!

Hope you are having a great day!

Patrick

On 03/11/2013 10:35 AM, Regina Henschel wrote:
> Hi all,
>
> compared with draw:blue the description of draw:luminance and
> draw:contrast is not sufficient to implement these attributes.
>
> Please read the specification of "20.94 draw:blue" and then compare it
> with those from "20.105 draw:contrast" and "20.135 draw:luminance":
> "The draw:luminance attribute specifies a signed percentage value that
> sets the output luminance of a bitmap or raster graphic."
> "The draw:contrast attribute specifies a signed percentage value that
> sets the output contrast of a bitmap or raster graphic."
>
> These attributes do not "set" luminance or contrast. But both attributes
> are used in a mapping of the original RGB-values to the output
> RGB-values, together with the draw:red, draw:green and draw:blue values.
>
> Kind regards
> Regina

--
Patrick Durusau
patrick@durusau.net
Technical Advisory Board, OASIS (TAB)
Former 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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