View Issue Details
|ID||Project||Category||View Status||Date Submitted||Last Update|
|0006107||Scribus||Color Management||public||2007-08-18 12:02||2008-05-18 14:13|
|Target Version||1.3.5||Fixed in Version||1.3.5svn|
|Summary||0006107: Decide on small standard color set for 1.3.5 release|
|Tags||No tags attached.|
Please add Rich Black with the following values in the short list :
100K - 60C - 40M - 40Y
||Basic set now in SVN.. test and request additions as you like.|
||Hmm, I asked some printers over here, and they only use additional C (between 30 and 70%).|
Back in the time of films, I remember there used to be one mix: 100% Black and 50% Cyan. Now that we have CTP and material and time is not an issue anymore (wrt stripping), we find mixes such as the one I suggested earlier.
I think the most important is to set one rich black and put a clear tooltip about what can be done and what should be avoided at all cost. We want to avoid total ink 400% like we see sometimes.
I suggested this mix according to a few printers here. I browsed a few "GATF-like sites", and others, and couldn't find any "authorities" on rich black. So I ended up suggesting a well-known and neutral mix here. Adding C only will of course give that black a tint of cold! Really, it depends. One of the idea behind rich black is to carry less ink as to not destroy the tones in a picture nearby, for instance.
I'm not a specialist, but wouldn't it be good to add Orange and Green to comply with the hexachrome CMYKOG colour set ? It seems some printers can use it.
||CMYKOG belongs to Pantone. It is a trademark and it is patented, as far as I can tell from http://en.wikipedia.org/wiki/Hexachrome|
||And Hexachrome export isn't supported by Scribus (yet) anyway. There's a separte RFE for it: http://bugs.scribus.net/view.php?id=4641|
And to add a bit of theory here, I understand that in a hexachrome color space, you don't really make use of the Orange and the Green as such. Instead, it allows to work in RGB and with the help of 6 colors instead of 4 on press you can reproduce 1) the RGB gamut and 2) more Pantone spot colors than with the regular CMYK (which is actually pretty bad at reproducing PMS).
I don't know how successful hexachrome is on the market. You need 1,5 times the plates you'd need for a regular job (more material, more time, more cost) and you ideally want a 6-color press, which is not uncommon but you won't find that on each corner. Plus, 6-color presses are often used not for hexachrome but for other printing options. My bet is this is a very specialised niche.
|OK I have added Cool and Warm Blacks as well. these seem to be the three most common.|
|OK, trying to backport this is difficult. It is fixed in 135svn.|
|2007-08-18 12:02||cbradney||New Issue|
|2007-08-18 12:02||cbradney||Status||new => assigned|
|2007-08-18 12:02||cbradney||Assigned To||=> plinnell|
|2007-08-18 12:02||cbradney||Relationship added||child of 0005693|
|2007-08-19 15:29||christoph_s||Relationship added||related to 0006122|
|2007-08-31 20:56||louisdesjardins||Note Added: 0017231|
|2007-10-01 22:48||cbradney||Note Added: 0017501|
|2007-10-02 00:57||christoph_s||Note Added: 0017504|
|2007-10-02 03:34||louisdesjardins||Note Added: 0017505|
|2007-10-08 17:24||brunod||Note Added: 0017554|
|2007-10-08 17:42||louisdesjardins||Note Added: 0017556|
|2007-10-08 17:57||christoph_s||Note Added: 0017557|
|2007-10-08 18:24||louisdesjardins||Note Added: 0017559|
|2007-12-20 22:52||cbradney||Target Version||=> 1.3.5svn|
|2007-12-26 17:02||cbradney||Target Version||1.3.5svn => 1.3.5|
||Note Added: 0019568|
||Note Added: 0019573|
||Status||assigned => resolved|
||Fixed in Version||=> 1.3.5svn|
||Resolution||open => fixed|
|2008-05-18 14:13||jghali||Status||resolved => closed|