blob: 07ac8e2fa97d2cf2b03314e8dacaf11c3ee8225a (
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%%Title: /clearcase/otp/system/doc/efficiency_guide/digger.ps
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%%Pages: 1
%%DocumentFonts:
%%EndComments
%%EndProlog
%%Page: 1 1
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20 dict begin
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/pix 96 string def
% define space for color conversions
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% lower left corner
290 380 translate
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31.96800 31.96800 scale
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% ('colortogray' and 'mergeprocs' come from xwd2ps
% via xgrab)
/colorimage where % do we know about 'colorimage'?
{ pop } % yes: pop off the 'dict' returned
{ % no: define one
/colortogray { % define an RGB->I function
/rgbdata exch store % call input 'rgbdata'
rgbdata length 3 idiv
/npixls exch store
/rgbindx 0 store
0 1 npixls 1 sub {
grays exch
rgbdata rgbindx get 20 mul % Red
rgbdata rgbindx 1 add get 32 mul % Green
rgbdata rgbindx 2 add get 12 mul % Blue
add add 64 idiv % I = .5G + .31R + .18B
put
/rgbindx rgbindx 3 add store
} for
grays 0 npixls getinterval
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% Utility procedure for colorimage operator.
% This procedure takes two procedures off the
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dup length
3 -1 roll
dup
length
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5 1 roll
3 -1 roll
add
array cvx
dup
3 -1 roll
0 exch
putinterval
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putinterval
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/colorimage { % def
pop pop % remove 'false 3' operands
{colortogray} mergeprocs
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showpage
% stop using temporary dictionary
end
% restore original state
origstate restore
%%Trailer
|
