Aw: Re: freieFarbe/freeColour HLC colour system to be accepted as a national standard for "Open Colour Communication" in Germany

["Christoph Schäfer"]

Hi Stuart,



Please forget the dtp studio PDF file. It's outdated and was never meant to be a digital colour reference, only a preview of the physical product.


The new PDF will be a multi-layer file, with colour values for several output targets (spectral colours, L*a*b*, sRGB, at least one CMYK target, probably ISO Coated v.2).


There will also be a new SOC file available (unless you plan to implement an import filter for CxF files), which will be called "DIN-CIEHLC" or something like that. Since CxF allows multiple versions of the "same" colours in one file, we'll probably release one single CxF palette with at least spectral colours, L*a*b* colours and sRGB colours.


Christoph


> Gesendet: Sonntag, 03. Dezember 2017 um 20:51 Uhr
> Von: "V Stuart Foote" <VStuart.Foote at utsa.edu>
> An: libreoffice at lists.freedesktop.org
> Betreff: Re: freieFarbe/freeColour HLC colour system to be accepted as a national standard for "Open Colour Communication" in Germany
>
> "Christoph Schäfer" wrote
> > ...
> > 
> > Currently, an older version of the HLC palette is already included in
> > Scribus 1.5.3+ (L*a*b*) and the latest LibreOffice (sRGB). And speaking of
> > Scribus, the juicy bit is that the colour reference will most likely be
> > produced with Scribus 1.5.4svn, because it offers the highest colour
> > precision for fill colours (64 bit). No other DTP software comes close in
> > this regard.
> 
> Christoph, *
> 
> This is a logical progression and well received, congratulations!  
> 
> So LibreOffice now needs to verify our sRGB .soc palette to matches the sRGB
> values for the HLC/CIE Lab colors submitted to DIN.
> 
> As noted in our BZ tdf#104052 when we implemented an HLC color palette, the
> dtpStudio prepared PDF color fan had listed sRGB values for each HLC color
> could differ considerably from the sRGB color values of   freecolour-hlc.soc
> <https://opengrok.libreoffice.org/xref/core/extras/source/palettes/freecolour-hlc.soc>  
> we distribute.
> 
> Not wrong (the CIELAB color conversion to sRGB depends on algorithm
> used--adobe CMS vs little-CMS2 and ICC profile) but we need to assure that
> our published .soc file matches what has been submitted to DIN.  
> 
> Would you please post the sRGB listing of the DIN submission to the TDF BZ
> issue [1]?
> 
> Thanks!
> 
> Stuart
> 
> =-ref-=
> [1] https://bugs.documentfoundation.org/show_bug.cgi?id=104052
> 
> 
> 
> --
> Sent from: http://nabble.documentfoundation.org/Dev-f1639786.html
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