From: Hans van der Meer <H.vanderMeer@uva.nl>
To: NTG ConTeXt <ntg-context@ntg.nl>
Subject: cmyk in metapost
Date: Sun, 26 Jun 2011 13:51:23 +0200 [thread overview]
Message-ID: <E745CBE2-661C-4F83-973B-44B864380C7C@uva.nl> (raw)
I must be doing something wrong. But what?
Relevant part of Metapost code:
numeric Cb, Cr, Y, T, temp, graycolors;
Cb := 0; Cr := 1; Y = 2; T := 3; graycolors := 15;
numeric colors[][];for i = 0 upto graycolors:
temp := (graycolors - i) / graycolors;
colors[i][Cb] := temp; colors[i][Cr] := temp; colors[i][Y] := temp; colors[i][T] := 0;
endfor
def colorvalue(expr v) =
cmyk(colors[v][Cb], colors[v][Cr], colors[v][Y], colors[v][T])
enddef;
for i = 0 upto 15:
mycmyk[i] := colorvalue(i);
endfor
Used with drawdot... withcolor mycymk[index];
The error from metapost is in the generation of the cmyk colors:
! terminal: >> (redpart mycmyk0,greenpart mycmyk0,bluepart mycmyk0)
>> (1,1,1,0)
! Equation cannot be performed (color=cmykcolor).
<to be read again>
;
<for(0)> mycmyk[(EXPR0)]:=colorvalue((EXPR0));
ENDFOR
startsubtitle->...:mycmyk[i]:=colorvalue(i);endfor
Strangely the following does work without problems:
drawdot... withcolor colorvalue(index);
I got the code from the Metafun manual. Beta from ConTeXt ver: 2011.03.28 01:03 MKIV download.
Something obvious I am overlooking?
Hans van der Meer
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next reply other threads:[~2011-06-26 11:51 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-06-26 11:51 Hans van der Meer [this message]
2011-06-26 12:12 ` Hans Hagen
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