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% PDF/A-1b:2005
\enabletrackers[structure.tags,backend.tags,backend.xmp]
\setupbackend
[format=PDF/A-1b:2005,
intent=sRGB IEC61966-2.1, % use <info> entry here; otherwise problems with predefined default profile
profile=sRGB.icc, % use <filename> here
% profile={sRGB.icc,default_gray.icc}]
level=0]
\setuptagging[state=start] % needed even for 'b'-version
\setupcolors[cmyk=no]
\definecolor[rgbblack][b=0.01]
\definecolor[transtest][r=1,g=1,t=.5]
\starttext
\starttextcolor[rgbblack] % forced /DeviceGray causes problems; we need a trigger
Text is needed, otherwise tagging base entries are not applied.
\stoptextcolor
%\startTEXpage
\hbox\bgroup
\blackrule[width=1cm,height=1cm,color=red]
\blackrule[width=1cm,height=1cm,color=green]
\blackrule[width=1cm,height=1cm,color=blue]
\blackrule[width=1cm,height=1cm,color=rgbblack]
\blackrule[width=1cm,height=1cm,color=transtest]\hskip-.5cm
\blackrule[width=1cm,height=1cm,color=transtest]
\egroup
%\stopTEXpage
\stoptext
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