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https://github.com/ocrmypdf/OCRmyPDF.git
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76 lines
2.3 KiB
Python
76 lines
2.3 KiB
Python
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#!/usr/bin/env python3
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# -*- coding: utf-8 -*-
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#
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# © 2015: jbarlow83 (https://github.com/jbarlow83)
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#
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# Generate a PDFA_def.ps file for Ghostscript >= 9.14
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from __future__ import print_function, absolute_import, division
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from string import Template
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pdfa_def_template = u"""%!
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% This is a sample prefix file for creating a PDF/A document.
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% Feel free to modify entries marked with "Customize".
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% This assumes an ICC profile to reside in the file (ISO Coated sb.icc),
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% unless the user modifies the corresponding line below.
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% Define entries in the document Info dictionary :
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/ICCProfile ($icc_profile)
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def
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[ /Title ($pdf_title)
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/DOCINFO pdfmark
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% Define an ICC profile :
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[/_objdef {icc_PDFA} /type /stream /OBJ pdfmark
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[{icc_PDFA}
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<<
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/N currentpagedevice /ProcessColorModel known {
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currentpagedevice /ProcessColorModel get dup /DeviceGray eq
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{pop 1} {
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/DeviceRGB eq
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{3}{4} ifelse
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} ifelse
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} {
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(ERROR, unable to determine ProcessColorModel) == flush
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} ifelse
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>> /PUT pdfmark
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[{icc_PDFA} ICCProfile (r) file /PUT pdfmark
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% Define the output intent dictionary :
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[/_objdef {OutputIntent_PDFA} /type /dict /OBJ pdfmark
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[{OutputIntent_PDFA} <<
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/Type /OutputIntent % Must be so (the standard requires).
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/S /GTS_PDFA1 % Must be so (the standard requires).
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/DestOutputProfile {icc_PDFA} % Must be so (see above).
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/OutputConditionIdentifier ($icc_identifier)
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>> /PUT pdfmark
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[{Catalog} <</OutputIntents [ {OutputIntent_PDFA} ]>> /PUT pdfmark
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"""
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def _get_pdfa_def(icc_profile, pdf_title, icc_identifier):
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t = Template(pdfa_def_template)
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result = t.substitute(icc_profile=icc_profile,
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pdf_title=pdf_title,
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icc_identifier=icc_identifier)
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return result
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def generate_pdfa_def(target_filename, pdf_title='', icc='sRGB'):
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# How does find this directory on other platforms?
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if icc == 'sRGB':
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icc_profile = '/usr/local/share/ghostscript/iccprofiles/srgb.icc'
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else:
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raise NotImplementedError("Only supporting sRGB")
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ps = _get_pdfa_def(icc_profile, pdf_title, icc)
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# Since PostScript might not handle UTF-8 (it's hard to get a clear
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# answer), insist on ascii
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with open(target_filename, 'w', encoding='ascii') as f:
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f.write(ps)
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