Python djvu convert to pdf

aspose-com-gists / convert-djvu-to-pdf.py

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import aspose . pycore as aspycore

from aspose . imaging import Image , IntRange

from aspose . imaging . fileformats . djvu import DjvuImage

from aspose . imaging . fileformats . pdf import PdfDocumentInfo

from aspose . imaging . imageoptions import PdfOptions , DjvuMultiPageOptions

import os

if ‘TEMPLATE_DIR’ in os . environ :

templates_folder = os . environ [ ‘TEMPLATE_DIR’ ]

else :

templates_folder = r»C:\Users\USER\Downloads\templates»

delete_output = ‘SAVE_OUTPUT’ not in os . environ

data_dir = templates_folder

# Load a DjVu image

with aspycore . as_of ( Image . load ( os . path . join ( data_dir , «template.djvu» )), DjvuImage ) as image :

# Create an instance of PdfOptions and Initialize the metadata for Pdf document

export_options = PdfOptions ()

export_options . pdf_document_info = PdfDocumentInfo ()

# Create an instance of IntRange and initialize it with the range of DjVu pages to be exported

range_ = IntRange ( 0 , 1 )

# Initialize an instance of DjvuMultiPageOptions with range of DjVu pages to be exported and Save the result in PDF format

export_options . multi_page_options = DjvuMultiPageOptions ( range_ )

image . save ( os . path . join ( data_dir , «result.pdf» ), export_options )

if delete_output :

os . remove ( os . path . join ( data_dir , «result.pdf» ))

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import aspose . pycore as aspycore

from aspose . imaging import Image

from aspose . imaging . fileformats . djvu import DjvuImage

from aspose . imaging . fileformats . tiff . enums import TiffExpectedFormat

from aspose . imaging . imageoptions import TiffOptions , DjvuMultiPageOptions

import os

if ‘TEMPLATE_DIR’ in os . environ :

templates_folder = os . environ [ ‘TEMPLATE_DIR’ ]

else :

templates_folder = r»C:\Users\USER\Downloads\templates»

delete_output = ‘SAVE_OUTPUT’ not in os . environ

data_dir = templates_folder

# Load a DjVu image

with aspycore . as_of ( Image . load ( os . path . join ( data_dir , «template.djvu» )), DjvuImage ) as image :

# Create an instance of TiffOptions & use preset options for Black n While with Deflate compression

export_options = TiffOptions ( TiffExpectedFormat . TIFF_DEFLATE_BW )

# Initialize the DjvuMultiPageOptions and Call Save method while passing instance of TiffOptions

export_options . multi_page_options = DjvuMultiPageOptions ()

image . save ( os . path . join ( data_dir , «result.tiff» ), export_options )

if delete_output :

os . remove ( os . path . join ( data_dir , «result.tiff» ))

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import aspose . pycore as aspycore

from aspose . imaging import Image , IntRange

from aspose . imaging . fileformats . djvu import DjvuImage

from aspose . imaging . fileformats . tiff . enums import TiffExpectedFormat

from aspose . imaging . imageoptions import TiffOptions , DjvuMultiPageOptions

import os

if ‘TEMPLATE_DIR’ in os . environ :

templates_folder = os . environ [ ‘TEMPLATE_DIR’ ]

else :

templates_folder = r»C:\Users\USER\Downloads\templates»

delete_output = ‘SAVE_OUTPUT’ not in os . environ

data_dir = templates_folder

# Load a DjVu image

with aspycore . as_of ( Image . load ( os . path . join ( data_dir , «template.djvu» )), DjvuImage ) as image :

# Create an instance of TiffOptions & use preset options for Black n While with Deflate compression

export_options = TiffOptions ( TiffExpectedFormat . TIFF_DEFLATE_BW )

range_ = IntRange ( 0 , 1 )

# Initialize an instance of DjvuMultiPageOptions while passing instance of IntRange and Call Save method while passing instance of TiffOptions

export_options . multi_page_options = DjvuMultiPageOptions ( range_ )

image . save ( os . path . join ( data_dir , «result.tiff» ), export_options )

if delete_output :

os . remove ( os . path . join ( data_dir , «result.tiff» ))

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import aspose . pycore as aspycore

from aspose . imaging import Image , IntRange , Rectangle

from aspose . imaging . fileformats . png import PngColorType

from aspose . imaging . fileformats . djvu import DjvuImage

from aspose . imaging . imageoptions import PngOptions , DjvuMultiPageOptions

import os

if ‘TEMPLATE_DIR’ in os . environ :

templates_folder = os . environ [ ‘TEMPLATE_DIR’ ]

else :

templates_folder = r»C:\Users\USER\Downloads\templates»

delete_output = ‘SAVE_OUTPUT’ not in os . environ

data_dir = templates_folder

# Load a DjVu image

with aspycore . as_of ( Image . load ( os . path . join ( data_dir , «template.djvu» )), DjvuImage ) as image :

# Create an instance of PngOptions and Set ColorType to Grayscale

export_options = PngOptions ()

export_options . color_type = PngColorType . GRAYSCALE

# Create an instance of Rectangle and specify the portion on DjVu page

export_area = Rectangle ( 0 , 0 , 500 , 500 )

# Specify the DjVu page index and Initialize an instance of DjvuMultiPageOptions while passing index of DjVu page index and instance of Rectangle covering the area to be exported

export_page_index = 0

export_options . multi_page_options = DjvuMultiPageOptions ( export_page_index , export_area )

image . save ( os . path . join ( data_dir , «result.png» ), export_options )

if delete_output :

os . remove ( os . path . join ( data_dir , «result.png» ))

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import aspose . pycore as aspycore

from aspose . imaging import Image , LoadOptions

from aspose . imaging . fileformats . djvu import DjvuImage

from aspose . imaging . imageoptions import PngOptions

import os

if ‘TEMPLATE_DIR’ in os . environ :

templates_folder = os . environ [ ‘TEMPLATE_DIR’ ]

else :

templates_folder = r»C:\Users\USER\Downloads\templates»

delete_output = ‘SAVE_OUTPUT’ not in os . environ

data_dir = templates_folder

# Setting a memory limit of 50 megabytes for target loaded image

obj_init = LoadOptions ()

obj_init . buffer_size_hint = 50

with aspycore . as_of ( Image . load ( os . path . join ( data_dir , «template.djvu» ), obj_init ), DjvuImage ) as image :

page_num = 0

for page in image . pages :

out_file = os . path . join ( data_dir , f»page < page_num >.png» )

page . save ( out_file , PngOptions ())

if delete_output :

os . remove ( out_file )

page_num += 1

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import aspose . pycore as aspycore

from aspose . imaging import Image

from aspose . imaging . imageoptions import PngOptions

import os

import threading

if ‘TEMPLATE_DIR’ in os . environ :

templates_folder = os . environ [ ‘TEMPLATE_DIR’ ]

else :

templates_folder = r»C:\Users\USER\Downloads\templates»

delete_output = ‘SAVE_OUTPUT’ not in os . environ

data_dir = templates_folder

num_threads = 5

def thread_func ( path , output_file ):

try :

with Image . load ( path ) as image :

image . save ( output_file , PngOptions ())

finally :

if delete_output :

os . remove ( output_file )

input_file = os . path . join ( data_dir , «template.djvu» )

threads = []

for task_num in range ( num_threads ):

output_file = os . path . join ( data_dir , f»result_task < task_num >.png» )

thread = threading . Thread ( target = thread_func , args = ( input_file , output_file ))

threads . append ( thread )

thread . start ()

for thread in threads :

thread . join ()

Источник

angeloped / djvu2pdf.py

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#!/bin/python

import os

import sys

import time

import thread

# author: ~/angeloped

stat = []

def convrt ( fpath , fname ):

print ( «converting \» / \» . » . format ( fpath , fname ))

os . system ( «djvups \» / \» | ps2pdf — \» /pdfied/ \» » . format ( fpath , fname , fname . replace ( «.djvu» , «.pdf» )))

stat . pop ()

if __name__ == «__main__» :

if len ( sys . argv ) == 1 :

fpath = os . getcwd ()

elif len ( sys . argv )

buff_limit = int ( sys . argv [ 2 ]) if len ( sys . argv ) == 3 else 6

if os . path . exists ( sys . argv [ 1 ]):

fpath = sys . argv [ 1 ]

else :

print ( «target path not found.. setting ‘./’ as cwd.» )

fpath = os . getcwd ()

else :

print ( «simple usage: python djvu2pdf.py » )

if not os . path . exists ( «/pdfied» . format ( fpath )):

os . mkdir ( «/pdfied» . format ( fpath ))

for fname in os . listdir ( fpath ):

while len ( stat ) == buff_limit : # process limiter

time . sleep ( 1 )

if fname [ — 5 :] == «.djvu» :

thread . start_new_thread ( convrt , ( fpath , fname ,))

stat . append ( «» )

while bool ( stat ):

time . sleep ( 1 )

Источник

Convert DJVU to PDF using Python language

Transform DJVU to PDF using native Python language APIs and without need of any image editor or 3rd-party libraries.

Aspose.Imaging for Python

Overview

Download from PyPI

Easily get Aspose.Imaging for Python directly from PyPI using pip install aspose-imaging.

How to Convert DJVU to PDF Using Python

In order to convert DJVU to PDF, we’ll use Aspose.Imaging for Python via .NET API which is a feature-rich, powerful and easy to use image manipulation and conversion API for Python platform. You may install it using the following command from your system command.

The system command line

>> pip install aspose-imaging-python-net 

Steps to Convert DJVU to PDF via Python

Developers can easily load & convert DJVU files to PDF in just a few lines of code.

• Load DJVU file with Image.load method
• Create & set the instance of required subclass of ImageOptionsBase (e.g. BmpOptions, PngOptions, etc.)
• Call the Image.save method
• Pass file path with PDF extension & object of ImageOptionsBase class

System Requirements

Before running the conversion example code, make sure that you have the following prerequisites.

Free App to Convert DJVU to PDF

• Select or drag and drop DJVU image
• Choose format and click Convert button
• Click Download button to download PDF image

Convert DJVU to PDF — Python

DJVU What is DJVU File Format

DjVu, pronounced as “déjà vu”, is a graphics file format intended for scanned documents and books especially those which contain the combination of text, drawings, images and photographs. It was developed by AT&T Labs. It uses multiple techniques like image layer separation of text and background images, progressive loading, arithmetic coding and lossy compression for bitonal images. Since DJVU file can contain compressed yet high-quality colour images, photographs, text, and drawings and can be saved in less space therefore, it’s used on web as eBooks, manuals, newspapers, ancient documents, etc.

PDF What is PDF File Format

Portable Document Format (PDF) is a type of document created by Adobe back in 1990s. The purpose of this file format was to introduce a standard for representation of documents and other reference material in a format that is independent of application software, hardware as well as Operating System. The PDF file format has full capability to contain information like text, images, hyperlinks, form-fields, rich media, digital signatures, attachments, metadata, Geospatial features and 3D objects in it that can become as part of source document.

Other Supported Conversions

Using Python, one can easily convert different formats including.

Источник