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<div style="margin:0 0 10px 0;"><b>Gesendet:</b> Dienstag, 05. Dezember 2017 um 11:31 Uhr<br/>
<b>Von:</b> "Jan-Peter Homann" <homann@colormanagement.de><br/>
<b>An:</b> "Christoph Schäfer" <christoph-schaefer@gmx.de><br/>
<b>Betreff:</b> Re: CxF- colour plattes (e.g. from freie Farbe) in Open Source applications</div>
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<div class="moz-cite-prefix">Hallo Christoph,<br/>
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The work on the HLC Colour System could be accelerated, if someone would write us a script to build automatically pages based on a HLC colour palette with predefined CMYK-values for each HLC color.<br/>
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The script should create create rectangular boxes (alls the same size e.g. 10x10 mm) and place the box on pages according following rules:<br/>
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H / 10 = page No (e. H010 = Page1, H230 = Page23, we would have 36 Pages)<br/>
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L = Position from bottom up on the Page (e.g L=15 is the lowest position, L=90 the highest, (values are 15, 25, 35, 45, 55, 65, 75, 85, 90)<br/>
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C = Position from left to right (values are 10, 20, 30, .... 120 )<br/>
<br/>
The colour of each rectangle must have the CMYK colour values of the HLC colour<br/>
<br/>
Explanation:<br/>
We are printing our HLC colour Atlas on a 12 color inkjet system with a RIP using a fixed CMYK to 12 color transformation. Profiles are made with CMYK testcharts. After the calculation of the CMYK-values for every swatch, we are printing all patches, measure them with an automated chart reader and optimize the CMYK values after getting the measuring results.<br/>
At the end we have CMYK values for every color patch which lead to an optimal Lab-value for every HLC patch.<br/>
<br/>
In the master document of the HLC colour atlas, we manually choose the colour of each patch from the HLC CMYK palette. This takes some hours for 2000 patches... (we plan to generate different version of the coulor atlas e.g. coated and uncoated...)<br/>
<br/>
The Freie Farbe e.V. may / probably would sponsor/pay the creation of such a script, We currently have now idea how many hours / days it would take to create such a script...<br/>
If Scribus would be used to generate the HLC colour atlas pages with the script, it would be featured on the freie Farbe website and the documentation for the HLC colour system / colour atlas.<br/>
<br/>
So if somebody from the Scribus team would be interested to create such a script, please let us know. Based on the amount of time needed for the script, I´m optimistic to find a fair compensation for the script creation.<br/>
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Best regards<br/>
Jan-Peter<br/>
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Am 04.12.2017 um 12:02 schrieb "Christoph Schäfer":</div>
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<div>Hallo Jan-Peter,</div>
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<div>ich habe Deine Anfrage sowohl an die Mailingliste des LibreGraphics-"Dachprojektes" namens CREATE als auch an Marti Maria, dem Entwickler von lcms weitergeleitet. Mal sehen, was da an Rückmeldungen kommt.</div>
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<div>Wie ich aber schon früher geschrieben hatte, können wir Inkscape einstweilen vergessen. GIMP bietet in der Entwicklerversion (derzeit 2.9.6) LAB- und HLC-Unterstützung, und vielleicht findet sich jemand, der einen CxF-Filter implementiert. Technisch möglich wäre es jedenfalls. Krita unterstützt schon seit langem etliche Farbmodelle, darunter auch LAB, weil das Programm nicht nur für die Print-, sondern auch für die Filmproduktion eingesetzt wird.</div>
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<div>Nochmals zurück zu Scribus: Gebt uns unbedingt rechtzeitig Bescheid, falls Ihr für die Produktion des Farbatlasses noch eine Funktion benötigt. Wir sind ein kleines Team, aber deswegen auch flexibel.</div>
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<div>Beste Grüße</div>
<div>Christoph</div>
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<div style="margin: 0 0 10.0px 0;"><b>Gesendet:</b> Montag, 04. Dezember 2017 um 09:11 Uhr<br/>
<b>Von:</b> "Jan-Peter Homann" <a class="moz-txt-link-rfc2396E" href="mailto:homann@colormanagement.de" onclick="parent.window.location.href='homann@colormanagement.de'; return false;" target="_blank"><homann@colormanagement.de></a><br/>
<b>An:</b> "Christoph Schäfer" <a class="moz-txt-link-rfc2396E" href="mailto:christoph-schaefer@gmx.de" onclick="parent.window.location.href='christoph-schaefer@gmx.de'; return false;" target="_blank"><christoph-schaefer@gmx.de></a><br/>
<b>Cc:</b> "Eric Soder" <a class="moz-txt-link-rfc2396E" href="mailto:eric.soder@topics.ch" onclick="parent.window.location.href='eric.soder@topics.ch'; return false;" target="_blank"><eric.soder@topics.ch></a>, <a class="moz-txt-link-rfc2396E" href="mailto:everding@freiefarbe.de" onclick="parent.window.location.href='everding@freiefarbe.de'; return false;" target="_blank">"everding@freiefarbe.de"</a> <a class="moz-txt-link-rfc2396E" href="mailto:everding@freiefarbe.de" onclick="parent.window.location.href='everding@freiefarbe.de'; return false;" target="_blank"><everding@freiefarbe.de></a>, "Peter Jäger" <a class="moz-txt-link-rfc2396E" href="mailto:peter@pre2media.ch" onclick="parent.window.location.href='peter@pre2media.ch'; return false;" target="_blank"><peter@pre2media.ch></a><br/>
<b>Betreff:</b> CxF- colour plattes (e.g. from freie Farbe) in Open Source applications</div>
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<div class="moz-cite-prefix">Hi Christoph,<br/>
Thank you for your engagement with the Scribus team. I have some more questions, which probably need to be dicussed with the english speaking open source / prepress community:<br/>
<br/>
1) Handling spectral CxF data in open source applications:<br/>
------------------------------------------------------------------------------<br/>
- Do you know any existing open source libraries, which are converting spectral-data to Lab ?<br/>
- If yes, it is possible to combine this library with littleCMS (e.g. to make it easy for applications using littleCMS to convert spectral-data to Lab and use in littleCMS ?)<br/>
- if yes, do you think it makes sense to intergrate CxF support into this library ?<br/>
<br/>
2) CxF as universal XML-based dataformat for colour palettes in color critical open source applications ?<br/>
CxF ist is quite powerful dataformat to describe colour palettes. I supports not only spectral data, but also Lab-based colour palettes as also device specific color palettes (e.g. RGB or CMYK for a specified profile)<br/>
So far as I know, is CxF the only data format, which can be used to describe colour palettes and which is ISO standardized.<br/>
<br/>
So it may makes sense to discuss the handling of colour palettes not only Scribus related but in general for open source applications. It is e.g. possible to create a a CxF colour palette which contains:<br/>
- spectral data<br/>
- Lab-data for defined lightning condition (e.g. D50)<br/>
- sRGB data<br/>
<br/>
- specialized applications could use the spectral-data,<br/>
- ICC aware applicatons with LCMS support could use the Lab D50 data<br/>
- all other applications could use the sRGB-data<br/>
<br/>
3) Coordinate Scribus CxF Support with other Open Source projects ?<br/>
Do you think, that that it makes sense to coordinate the CxF support in Scribus with other open source projects, to e.g. create a library for CxF support with e.g. following functionality:<br/>
- extract RGB colour palettes for applications without LCMS support<br/>
- extract Lab- colout palettes for applications with LCMS support<br/>
- convert spectral data to Lab for applications with LCMS support, if no Lab-data is available ?<br/>
<br/>
Use cases would e.g. be:<br/>
- use CxF palettes in othe applications like e.g. Inkscape<br/>
- visualize a CxF color palette in 2D or 3D based on RGB-values<br/>
<br/>
Regards<br/>
Jan-Peter<br/>
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Am 04.12.2017 um 05:43 schrieb "Christoph Schäfer":</div>
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<div>Hallo zusammen,</div>
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<div>wir haben das Thema Farbatlas/DIN/CxF/Scribus gestern Scribus-intern diskutiert.</div>
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Jean Ghali hat folgendes vorgeschlagen: Er wird rechtzeitig zum Apriltermin (Fertigstellung bzw. Ablieferung des Farbatlasses und der CxF-Dateien) einen Import- und Exportfilter für CxF3-Paletten schreiben. Spektralfarben können zwar enthalten sein, werden aber für Benutzer als LAB-Farben sichtbar sein (d.h. konvertiert). Begründung: Scribus verwendet lcms fürs Farbmanagement, welches wiederum für ICC-v4-Workflows optimiert ist, was im Printbereich wohl mehr als ausreichend ist. Die Spektralfarben blieben aber dennoch für den Export erhalten, falls eine benutzerdefinierte Palette (wie in der CxF-Spezifikation beschrieben) in anderen Workflows verwendet werden soll.</div>
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<pre class="moz-signature">--
Homann colormanagement tel: +49 30 611 075 18
Jan-Peter Homann mob: +49 171 54 70 358
Herzbergstr. 55 <a class="moz-txt-link-abbreviated" href="http://www.colormanagement.de" target="_blank">www.colormanagement.de</a>
10365 Berlin <a class="moz-txt-link-freetext" href="mailto:homann@colormanagement.de" onclick="parent.window.location.href='homann@colormanagement.de'; return false;" target="_blank">mailto:homann@colormanagement.de</a>
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<pre class="moz-signature">--
Homann colormanagement tel: +49 30 611 075 18
Jan-Peter Homann mob: +49 171 54 70 358
Herzbergstr. 55 <a class="moz-txt-link-abbreviated" href="http://www.colormanagement.de" target="_blank">www.colormanagement.de</a>
10365 Berlin <a class="moz-txt-link-freetext" href="mailto:homann@colormanagement.de" onclick="parent.window.location.href='homann@colormanagement.de'; return false;" target="_blank">mailto:homann@colormanagement.de</a>
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