Hi! It's shadings and transparency again.
For most things transparency is not required since the background colour (white) can be used instead, to achieve the same effect (thanks Hans for the reimplementation/cleanup a while ago). For one use case I worked around this by including an external file and overlay the external file (see attached example). Background: In the actual documents the transparent overlays overlay images to have the edges fade into the page background (only the centre is of interest). Is there a method that does not require an external file or pre-processing? Using the external file works. Just wondering if there's a better - more integrated - way. Marco
\definecolor [transparent] [a=multiply, t=1, s=1]
\startuseMPgraphic{trans}
fill OverlayBox
withshademethod "linear" withshadevector (3, 0)
%% (white, "transparent") doesn't work here
withshadecolors (white, white) withtransparency (0, .7);
\stopuseMPgraphic
%% to illustrate the effect, actual background is white
\setupbackgrounds [page] [background=color, backgroundcolor=lightgray]
\defineoverlay [gradient-mp] [\useMPgraphic{trans}]
%% requires external file gradient-t.pdf
\defineoverlay [gradient-img] [{\externalfigure[gradient-t][width=\overlaywidth,height=\overlayheight]}]
\starttext
using external image:
\startframedtext [background={foreground, gradient-img}]
\input knuth
\stopframedtext
metapost:
\startframedtext [background={foreground, gradient-mp}]
\input knuth
\stopframedtext
\stoptext
5Z7.pdf
Description: Adobe PDF document
gradient-t.pdf
Description: Adobe PDF document
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