On Mon, Apr 6, 2015 at 6:11 AM, Henning Hraban Ramm <te...@fiee.net> wrote:
> Am 2015-04-04 um 22:00 schrieb Pavneet Arora <pavneet_ar...@waroc.com>: > > > This is great insight into the printing world. Of course, Pantone has a > > dominant position on this continent at least, but as you stated, its > > proprietary nature keeps the palette from being distributed easily. > > The same is probably true for RAL. > Be aware that RAL is no color system, but just an arbitrary and > historically grown collection. In this regard it’s even worse than X11 > colors. > There’s also RAL design system, that would be better, but it’s still > copyrighted and not suitable for CMYK or RGB devices. > > See e.g. > http://en.wikipedia.org/wiki/RAL_colour_standard > http://de.wikipedia.org/wiki/RAL-Farbe > > Conversions of RAL colors (that are defined in CIE L*a*b) are just > approximations for one special RGB color space, most probably sRGB, and > can’t cover everything, since every color space is rather limited. > > Conversions of L*a*b or any RGB colors into CMYK depend on several > parameters (rendering intent, GCR/UCR), because CMYK color spaces are > generally quite small, and you can hit the same color spot with different > mixtures of CMYK inks. > > > > So the question remains: if the X11 colourspace is found inadequate, is > > there another one that we might look for inspiration to create decent > > spot colours for document processing? Even if RAL colours are used for > > varnish, does that mitigate the use of their RGB values for other > > paints? Note, that I am not seeking exact calibration of colours, say > > for branding across different media; just a more expressive palette for > > print applications. > > > > Unfortunately, I don't have access to the Adobe products that you > > mention, and in any case would just want a convenient set of colours > > inside ConTeXt to create documents on the fly. > > > > For this type of work, are there any other "open source" palettes that > > we might look towards? > > Spot colors for printing rely on manufacturers that produce those > inks/paints. > The existing palettes are defined by (or in cooperation with) > manufacturers. > There exists nothing like open source paint recipes, AFAIK, so it would > make no sense to define an open source (i.e. freely licensed) > palette/system of spot colors. > > Of course it’s possible to define a system of (anyhow) matching colors. > But that’s so much a matter of taste and application that I wouldn’t start > with such an enterprise. > There are some good online tools that help you finding matching design > colors, at least for (s)RGB, e.g. Adobe Kuler or paletton.com. > If you need spot colors for printing, you need a (digital or physical) > palette from the manufacturers. > > > Interesting topic. I just add for the record http://wiki.scribus.net/canvas/How_to_legally_obtain_spot_colour_palettes_for_use_in_Scribus_1.3.3.x_and_later_versions http://www.selapa.net/swatchbooker/ -- luigi
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