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%!PS-Adobe-2.0 EPSF-2.0
%%Title: /clearcase/otp/system/doc/efficiency_guide/digger.ps
%%Creator: XV Version 3.10a Rev: 12/29/94 - by John Bradley
%%BoundingBox: 290 380 322 412
%%Pages: 1
%%DocumentFonts:
%%EndComments
%%EndProlog
%%Page: 1 1
% remember original state
/origstate save def
% build a temporary dictionary
20 dict begin
% define string to hold a scanline's worth of data
/pix 96 string def
% define space for color conversions
/grays 32 string def % space for gray scale line
/npixls 0 def
/rgbindx 0 def
% lower left corner
290 380 translate
% size of image (on paper, in 1/72inch coords)
31.96800 31.96800 scale
% define 'colorimage' if it isn't defined
% ('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
} bind def
% Utility procedure for colorimage operator.
% This procedure takes two procedures off the
% stack and merges them into a single procedure.
/mergeprocs { % def
dup length
3 -1 roll
dup
length
dup
5 1 roll
3 -1 roll
add
array cvx
dup
3 -1 roll
0 exch
putinterval
dup
4 2 roll
putinterval
} bind def
/colorimage { % def
pop pop % remove 'false 3' operands
{colortogray} mergeprocs
image
} bind def
} ifelse % end of 'false' case
32 32 8 % dimensions of data
[32 0 0 -32 0 32] % mapping matrix
{currentfile pix readhexstring pop}
false 3 colorimage
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showpage
% stop using temporary dictionary
end
% restore original state
origstate restore
%%Trailer
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