CODEWITHSUNDEEP
ghostscriptpostscript
Pranjal
Pranjal

Reputation: 689

error in conversion of raster file to postscript file

I am trying to convert PWG raster file data into postscript data. I have generated at test file which is as follows:

%!PS-Adobe-3.0
%%BoundingBox: 0 0 5100 6600
%Creator: Cups-Filters
%LanguageLevel: 2
%DocumentData: Clean7Bit
%EndComments
%BeginProlog
%EndProlog

%Pages: (atend)
%%Page: 1 1
%%BeginPageSetup
<< /PageSize[5100 6600]/ImagingBBox null>> setpagedevice
%%EndPageSetup
gsave
gsave
5100 6600 scale
5100 6600 8 [5100 0 0 -6600 0 6600]
{currentfile 3 5100 string readhexstring pop} bind
false 3 colorimage

...hexadecimal information cut...

grestore
showpage
%PageTrailer
%Trailer
%%Pages: 1
%EOF

Whenever I try to run the program using GhostScript interpretor, I get the following error:

$ ghostscript sample.ps 
GPL Ghostscript 9.18 (2015-10-05)
Copyright (C) 2015 Artifex Software, Inc.  All rights reserved.
This software comes with NO WARRANTY: see the file PUBLIC for details.
Error: /typecheck in --colorimage--
Operand stack:
   --nostringval--   3   (\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000...)
Execution stack:
   %interp_exit   .runexec2   --nostringval--   --nostringval--   --nostringval--   2   %stopped_push   --nostringval--   --nostringval--   --nostringval--   false   1   %stopped_push   1977   1   3   %oparray_pop   1976   1   3   %oparray_pop   1960   1   3   %oparray_pop   1852   1   3   %oparray_pop   --nostringval--   %errorexec_pop   .runexec2   --nostringval--   --nostringval--   --nostringval--   2   %stopped_push   --nostringval--   1878   7   3   %oparray_pop
Dictionary stack:
   --dict:1194/1684(ro)(G)--   --dict:0/20(G)--   --dict:78/200(L)--
Current allocation mode is local
Current file position is 399
GPL Ghostscript 9.18: Unrecoverable error, exit code 1

The PS file is about 128 MB with about 99% data being the hexadecimal representation of the coloured image.

I tried searching it and one source suggested to add 'setpagedevice' parameter to the PS file. I have added it but to no effect.

How can I get rid of this error ? Also, is there any other way to represent very large images in postscript ?

Upvotes: 3

Views: 170

Answers (1)

KenS
KenS

Reputation: 31141

Your code contains:

{currentfile 3 5100 string readhexstring pop} bind

If we break that up and add comments about the stack content we get:

{
  currentfile    % Stack contents: -file-
  3              % stack contents: -file- 3
  5100           % stack contents: -file- 3 5100
  string         % string consumes the top operand, creates a string
                 % object of that size, and places the string on the stack
                 % stack contains: -file- 3 (string)
  readhexstring  % consume string and file operands, return substring, bool
                 %
  pop            % pop the boolean
}

The problem is that readhexstring expects to see -file- (string) but the stack actually contains 3 (string), 3 isn't a file object so you get a typecheck error.

Upvotes: 2

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