\showlayoutcomponents % \nopdfcompression

\setupinteraction
  [title=TITLE,
   subtitle=SUBTITLE,
   author=AUTHOR,
   keyword={{KEYWORD1, KEYWORD2}, KEYWORD3}]

\definecolor[cmykcyan][c=1]
\definecolor[cmykmagenta][m=1]
\definecolor[cmykyellow][y=1]
\definecolor[cmykblack][k=1]
\definecolor[transtest][y=1,a=1,t=.5]

\starttext

\startTEXpage
    \blackrule[width=1cm,height=1cm,color=cmykcyan]
    \blackrule[width=1cm,height=1cm,color=cmykmagenta]
    \blackrule[width=1cm,height=1cm,color=cmykyellow]
    \blackrule[width=1cm,height=1cm,color=cmykblack]
    \blackrule[width=1cm,height=1cm,color=transtest]\hskip-.5cm
    \blackrule[width=1cm,height=1cm,color=transtest]
\stopTEXpage

\startTEXpage
    \tt Some text.
\stopTEXpage

\stoptext