Re: Colors changing when applying "transparent"

[Hans Hagen <pragma@wxs.nl>]

At 09:20 25/11/2003, you wrote:
>\setupoutput[pdftex]
>\starttext
>\setupcolors[state=start]
>
>\startuseMPgraphic{tBG}
>         path p ;
>         p := unitsquare xscaled \overlaywidth yscaled \overlayheight ;
>         fill p withcolor \MPcolor{white}; % With normal colors, 
> everything is fine (blue is really RGB(0,0,1)
>         % fill p withcolor transparent("normal",.5,\MPcolor{white}); % 
> This however results in fading of ALL of the colors...
>\stopuseMPgraphic
>
>\defineoverlay[textBG][\useMPgraphic{tBG}]
>
>\setupbackgrounds[page][background=color,backgroundcolor=blue]
>\setupbackgrounds[text][background=textBG]
>
>\input tufte
>\stoptext

Looks like an acrobat bug to me; if you use gsview, it works ok; there are 
more problems with acrobat and transparencies, like

- no smoothing when a vector graphic is on top of a transparency
- disappearing characters (esp very big ones)
- funny flattener preview colors

One of the reasons for such problems is that there is no 'reset graphics 
state' operator and i guess that occasionally the acrobat graphic state 
stack gets messed up.

Hans



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