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diff --git a/doc/context/sources/general/manuals/colors/colors-introduction.tex b/doc/context/sources/general/manuals/colors/colors-introduction.tex new file mode 100644 index 000000000..ba1db9915 --- /dev/null +++ b/doc/context/sources/general/manuals/colors/colors-introduction.tex @@ -0,0 +1,49 @@ +% language=uk + +\startcomponent colors-introduction + +\environment colors-environment + +\startchapter[title=Introduction][color=darkgray] + +This manual fits in the series where we discus fundamental subsystems like fonts +and languages. Here we will collect the more technical backgrounds. This document +is not meant as a manual for users who start with \CONTEXT, for that we have +other manuals. + +Color has a rather long history in \CONTEXT\ because we supported it right from +the start. In the times that \DVI\ backend drivers were used, specials were the +way to force color in the result. However, each driver had different demands: +some expected specific color directives, others a sequence of for instance +\POSTSCRIPT\ commands. When \PDF\ showed up, resource management entered the +game. Because ot always used a backend driver model in \CONTEXT, it could easily +be adapted. All management, for instance of nested colors, was done in \TEX\ +code. If advanced color support hadn't been available right from the start, we'd +probably not be using \TEX\ now. + +In \MKIV\ color support was implemented from scratch but in a for the user +downward compatible way. In that respect this manual is not going to reveal +anything revolutionary. Much of the work is now delegated to \LUA\ and because of +that directives are no longer part of the (expanded) input stream. As a result +color is now more robust and less intrusive. + +Because \METAPOST\ support is well integrated, we also communicate colors to +\METAPOST. In \MKIV\ the communication between the two engines was upgraded and +hopefully evolved into an (even) more convenient interface. + +External graphics are in fact islands in the document flow: they manage their +resources like colors themselves. However, there are some ways to deal with the +demands of publishers and printers with respect to colors. These will be +discussed too. + +\getbuffer[underconstruction] + +\startlines +Hans Hagen +PRAGMA ADE, Hasselt NL +2016 +\stoplines + +\stopchapter + +\stopcomponent |