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eps2pdf.m
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eps2pdf.m
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function eps2pdf(source, dest, crop, append, gray, quality, gs_options)
%EPS2PDF Convert an eps file to pdf format using ghostscript
%
% Examples:
% eps2pdf source dest
% eps2pdf(source, dest, crop)
% eps2pdf(source, dest, crop, append)
% eps2pdf(source, dest, crop, append, gray)
% eps2pdf(source, dest, crop, append, gray, quality)
% eps2pdf(source, dest, crop, append, gray, quality, gs_options)
%
% This function converts an eps file to pdf format. The output can be
% optionally cropped and also converted to grayscale. If the output pdf
% file already exists then the eps file can optionally be appended as a new
% page on the end of the eps file. The level of bitmap compression can also
% optionally be set.
%
% This function requires that you have ghostscript installed on your system.
% Ghostscript can be downloaded from: http://www.ghostscript.com
%
% Inputs:
% source - filename of the source eps file to convert. The filename is
% assumed to already have the extension ".eps".
% dest - filename of the destination pdf file. The filename is assumed
% to already have the extension ".pdf".
% crop - boolean indicating whether to crop the borders off the pdf.
% Default: true.
% append - boolean indicating whether the eps should be appended to the
% end of the pdf as a new page (if the pdf exists already).
% Default: false.
% gray - boolean indicating whether the output pdf should be grayscale
% or not. Default: false.
% quality - scalar indicating the level of image bitmap quality to
% output. A larger value gives a higher quality. quality > 100
% gives lossless output. Default: ghostscript prepress default.
% gs_options - optional ghostscript options (e.g.: '-dNoOutputFonts'). If
% multiple options are needed, enclose in call array: {'-a','-b'}
% Copyright (C) Oliver Woodford 2009-2014, Yair Altman 2015-
% Suggestion of appending pdf files provided by Matt C at:
% http://www.mathworks.com/matlabcentral/fileexchange/23629
% Thank you Fabio Viola for pointing out compression artifacts, leading to the quality setting.
% Thank you Scott for pointing out the subsampling of very small images, which was fixed for lossless compression settings.
% 09/12/11: Pass font path to ghostscript
% 26/02/15: If temp dir is not writable, use the dest folder for temp destination files (Javier Paredes)
% 28/02/15: Enable users to specify optional ghostscript options (issue #36)
% 01/03/15: Upon GS error, retry without the -sFONTPATH= option (this might solve
% some /findfont errors according to James Rankin, FEX Comment 23/01/15)
% 23/06/15: Added extra debug info in case of ghostscript error; code indentation
% 04/10/15: Suggest a workaround for issue #41 (missing font path; thanks Mariia Fedotenkova)
% 22/02/16: Bug fix from latest release of this file (workaround for issue #41)
% 20/03/17: Added informational message in case of GS croak (issue #186)
% 16/01/18: Improved appending of multiple EPS files into single PDF (issue #233; thanks @shartjen)
% 18/10/19: Workaround for GS 9.51+ .setpdfwrite removal problem (issue #285)
% 18/10/19: Warn when ignoring GS fontpath or quality options; clarified error messages
% 15/01/20: Added information about the GS/destination filepath in case of error (issue #294)
% 20/01/20: Attempted fix for issue #285: unsupported patch transparency in some Ghostscript versions
% 12/02/20: Improved fix for issue #285: add -dNOSAFER and -dALLOWPSTRANSPARENCY (thanks @linasstonys)
% 26/08/21: Added GS version to error message; fixed some problems with PDF append (issue #339)
% Intialise the options string for ghostscript
options = ['-q -dNOPAUSE -dBATCH -sDEVICE=pdfwrite -dPDFSETTINGS=/prepress -sOutputFile="' dest '"'];
% Set crop option
if nargin < 3 || crop
options = [options ' -dEPSCrop'];
end
% Set the font path
fp = font_path();
if ~isempty(fp)
options = [options ' -sFONTPATH="' fp '"'];
end
% Set the grayscale option
if nargin > 4 && gray
options = [options ' -sColorConversionStrategy=Gray -dProcessColorModel=/DeviceGray'];
end
% Set the bitmap quality
qualityOptions = '';
if nargin > 5 && ~isempty(quality)
qualityOptions = ' -dAutoFilterColorImages=false -dAutoFilterGrayImages=false';
if quality > 100
qualityOptions = [qualityOptions ' -dColorImageFilter=/FlateEncode -dGrayImageFilter=/FlateEncode'];
qualityOptions = [qualityOptions ' -c ".setpdfwrite << /ColorImageDownsampleThreshold 10 /GrayImageDownsampleThreshold 10 >> setdistillerparams"'];
else
qualityOptions = [qualityOptions ' -dColorImageFilter=/DCTEncode -dGrayImageFilter=/DCTEncode'];
v = 1 + (quality < 80);
quality = 1 - quality / 100;
s = sprintf('<< /QFactor %.2f /Blend 1 /HSample [%d 1 1 %d] /VSample [%d 1 1 %d] >>', quality, v, v, v, v);
qualityOptions = [qualityOptions ' -c ".setpdfwrite << /ColorImageDict ' s ' /GrayImageDict ' s ' >> setdistillerparams"'];
end
options = [options qualityOptions];
end
% Enable users to specify optional ghostscript options (issue #36)
if nargin > 6 && ~isempty(gs_options)
if iscell(gs_options)
gs_options = sprintf(' %s',gs_options{:});
elseif ~ischar(gs_options)
error('gs_options input argument must be a string or cell-array of strings');
else
gs_options = [' ' gs_options];
end
options = [options gs_options];
end
% Check if the output file exists
if nargin > 3 && append && exist(dest, 'file') == 2
% Store the original filesize for later use below
try
file_info = dir(dest);
orig_bytes = file_info.bytes;
catch
orig_bytes = [];
end
% File exists - append current figure to the end
tmp_nam = [tempname '.pdf'];
[fpath,fname,fext] = fileparts(tmp_nam);
try
% Ensure that the temp dir is writable (Javier Paredes 26/2/15)
fid = fopen(tmp_nam,'w');
fwrite(fid,1);
fclose(fid);
delete(tmp_nam);
catch
% Temp dir is not writable, so use the dest folder
fpath = fileparts(dest);
tmp_nam = fullfile(fpath,[fname fext]);
end
% Copy the original (dest) pdf file to temporary folder
copyfile(dest, tmp_nam);
% Produce an interim pdf of the source eps, rather than adding the eps directly (issue #233)
% this will override the original (dest) pdf file
orig_options = options;
ghostscript([options ' -f "' source '"']);
[~,fname] = fileparts(tempname);
tmp_nam2 = fullfile(fpath,[fname fext]); % ensure using a writable folder (not necessarily tempdir)
copyfile(dest, tmp_nam2);
% Add the original pdf (tmp_nam) and interim pdf (dest=>tmp_nam2) as inputs to ghostscript
%options = [options ' -f "' tmp_nam '" "' source '"']; % append the source eps to dest pdf
options = [options ' -f "' tmp_nam '" "' tmp_nam2 '"']; % append the interim pdf to dest pdf
try
% Convert to pdf using ghostscript
[status, message] = ghostscript(options);
% The output pdf should now be in dest
% If the returned message is non-empty, a possible error may have
% occured, so check the file size to ensure whether the file grew
if ~isempty(message) && ~isempty(orig_bytes)
file_info = dir(dest);
new_bytes = file_info.bytes;
if new_bytes < orig_bytes + 100
% Looks like nothing substantial (if anything) was appended to
% the original pdf, so try adding the eps file directly (issue #339)
options = [orig_options ' -f "' tmp_nam '" "' source '"']; % append the source eps to dest pdf
[status, message] = ghostscript(options);
end
end
% Delete the intermediate (temporary) files
delete(tmp_nam);
delete(tmp_nam2);
catch me
% Delete the intermediate files and rethrow the error
delete(tmp_nam);
delete(tmp_nam2);
rethrow(me);
end
else
% File doesn't exist or should be over-written
% Add the source eps file as input to ghostscript
options = [options ' -f "' source '"'];
% Convert to pdf using ghostscript
[status, message] = ghostscript(options);
end
% Check for error
if status
% Catch and correct undefined .setopacityalpha errors (issue #285)
% (see explanation inside print2eps.m)
if ~isempty(regexpi(message,'undefined in .setopacityalpha'))
% First try with -dNOSAFER and -dALLOWPSTRANSPARENCY (thanks @linasstonys)
new_options = [options ' -dNOSAFER -dALLOWPSTRANSPARENCY'];
[status, message] = ghostscript(new_options);
if ~status % hurray! (no error)
return
elseif isempty(regexpi(message,'undefined in .setopacityalpha')) % still some other error
options = new_options;
else % we still get a .setopacityalpha error
% Remove the transparency and retry
fstrm = read_write_entire_textfile(source);
fstrm = regexprep(fstrm, '0?\.\d+ .setopacityalpha \w+\n', '');
read_write_entire_textfile(source, fstrm);
[status, message] = ghostscript(options);
if ~status % hurray! (no error)
% Alert the user that transparency is not supported
warning('export_fig:GS:quality','Export_fig Face/Edge alpha transparancy is ignored - not supported by your Ghostscript version')
return
end
end
end
% Retry without the -sFONTPATH= option (this might solve some GS
% /findfont errors according to James Rankin, FEX Comment 23/01/15)
orig_options = options;
if ~isempty(fp)
options = regexprep(options, ' -sFONTPATH=[^ ]+ ',' ');
[status, message] = ghostscript(options);
if ~status % hurray! (no error)
warning('export_fig:GS:fontpath','Export_fig font option is ignored - not supported by your Ghostscript version')
return
end
end
% Retry without quality options (may solve problems with GS 9.51+, issue #285)
if ~isempty(qualityOptions)
options = strrep(orig_options, qualityOptions, '');
[status, message] = ghostscript(options);
if ~status % hurray! (no error)
warning('export_fig:GS:quality','Export_fig quality option is ignored - not supported by your Ghostscript version')
return
end
end
% Report error
if isempty(message)
error(['Unable to generate pdf. Ensure that the destination folder (' fileparts(dest) ') is writable.']);
elseif ~isempty(strfind(message,'/typecheck in /findfont')) %#ok<STREMP>
% Suggest a workaround for issue #41 (missing font path)
font_name = strtrim(regexprep(message,'.*Operand stack:\s*(.*)\s*Execution.*','$1'));
fprintf(2, 'Ghostscript error: could not find the following font(s): %s\n', font_name);
%fpath = fileparts(mfilename('fullpath'));
%gs_fonts_file = fullfile(fpath, '.ignore', 'gs_font_path.txt');
[unused, gs_fonts_file] = user_string('gs_font_path'); %#ok<ASGLU>
fprintf(2, ' try to add the font''s folder to your %s file\n\n', gs_fonts_file);
error('export_fig error');
else
gs_options = strtrim(gs_options);
fprintf(2, '\nGhostscript error: ');
msg = regexprep(message, '^Error: /([^\n]+).*', '$1');
if ~isempty(msg) && ~strcmp(msg,message)
fprintf(2,'%s',msg);
end
fprintf(2, '\n * perhaps %s is open by another application\n', dest);
try gs_version = str2num(evalc('ghostscript(''--version'');')); catch, gs_version = ''; end %#ok<ST2NM>
if ~isempty(gs_version), gs_version = [' ' num2str(gs_version)]; end
if ~isempty(gs_options)
fprintf(2, ' * or maybe your Ghostscript version%s does not accept the extra "%s" option(s) that you requested\n', gs_version, gs_options);
end
fprintf(2, ' * or maybe you have another gs executable in your system''s path\n\n');
fprintf(2, 'Ghostscript path: %s\n', user_string('ghostscript'));
fprintf(2, 'Ghostscript options: %s\n\n', orig_options);
error(message);
end
end
end
% Function to return (and create, where necessary) the font path
function fp = font_path()
fp = user_string('gs_font_path');
if ~isempty(fp)
return
end
% Create the path
% Start with the default path
fp = getenv('GS_FONTPATH');
% Add on the typical directories for a given OS
if ispc
if ~isempty(fp)
fp = [fp ';'];
end
fp = [fp getenv('WINDIR') filesep 'Fonts'];
else
if ~isempty(fp)
fp = [fp ':'];
end
fp = [fp '/usr/share/fonts:/usr/local/share/fonts:/usr/share/fonts/X11:/usr/local/share/fonts/X11:/usr/share/fonts/truetype:/usr/local/share/fonts/truetype'];
end
user_string('gs_font_path', fp);
end