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Convert DJVU to JPG via Ruby Cloud API

Transform DJVU into JPG using native Ruby Cloud APIs without needing any image editor or 3rd-party libraries.

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How to Convert DJVU to JPG Using Ruby Cloud API

Aspose.Imaging.Cloud for Ruby API which is a feature-rich, powerful and easy to use image manipulation and conversion Cloud API for Ruby platform. You can download its latest version directly from rubygems.org or install it from gem command line.

Command Prompt


> gem install aspose_imaging_cloud

Steps to Convert DJVU to JPG via Ruby Cloud API

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

  • Load DJVU file as stream
  • Create & set the instance of CreateConvertedImageRequest
  • Call the CreateConvertedImage method
  • Get converted image from response stream

System Requirements

Aspose.Imaging Cloud for Ruby is supported on all major operating systems. Just make sure that you have the following prerequisites.

  • Ruby version >= 2.5.1
 

Convert DJVU to JPG - Cloud

require 'fileutils'
require 'aspose-imaging-cloud'
IMAGE_FILE_NAME= 'example_image.djvu';
IMAGES_FOLDER = 'ExampleImages';
CLOUD_FOLDER = 'CloudImages';
OUTPUT_FOLDER = 'Output';
# Get ClientId and ClientSecret from https://dashboard.aspose.cloud/
# or use on-premise version (https://docs.aspose.cloud/imaging/getting-started/how-to-run-docker-container/)
imaging_api = AsposeImagingCloud::ImagingApi.new(client_secret, client_id, 'https://api.aspose.cloud')
# Convert the image from cloud storage
def convert_image_from_storage
input_image = File.join(IMAGES_FOLDER, IMAGE_FILE_NAME)
upload_file_request = AsposeImagingCloud::UploadFileRequest.new(File.join(CLOUD_FOLDER, IMAGE_FILE_NAME), input_image)
result = self.imaging_api.upload_file(upload_file_request)
if result.errors.any?
puts('Uploading errors count: ' + result.errors.size.to_s)
# Please refer to
# https://docs.aspose.cloud/imaging/supported-file-formats/#convert
# for possible output formats
format = 'jpg' # Resulting image format
folder = CLOUD_FOLDER # Input file is saved at the desired folder in the storage
storage = nil # We are using default Cloud Storage
request = AsposeImagingCloud::ConvertImageRequest.new(IMAGE_FILE_NAME, format, folder, storage)
converted_image = imaging_api.convert_image(request)
# Save the image file to output folder
filename_part = File.basename(IMAGE_FILE_NAME, ".*")
image_name = filename_part + '.' + 'jpg'
path = File.absolute_path(File.join(OUTPUT_FOLDER, image_name))
File.write(path, converted_image)
end
# Convert an image. Image data is passed in a request stream
def create_converted_image_from_request
# Please refer to
# https://docs.aspose.cloud/imaging/supported-file-formats/#convert
# for possible output formats
format = 'jpg' # Resulting image format
storage = nil # We are using default Cloud Storage
out_path = nil # Path to updated file (if this is empty, response contains streamed image)
input_stream = File.open(File.join(IMAGES_FOLDER, IMAGE_FILE_NAME), 'r')
request = AsposeImagingCloud::CreateConvertedImageRequest.new(input_stream, format, out_path, storage)
converted_image = imaging_api.create_converted_image(request)
# Save the image file to output folder
filename_part = File.basename(IMAGE_FILE_NAME, ".*")
image_name = filename_part + '.' + 'jpg'
path = File.absolute_path(File.join(OUTPUT_FOLDER, image_name))
File.write(path, converted_image)
end
view raw djvu-to-jpg.rb hosted with ❤ by GitHub
 

About Aspose.Imaging Cloud API for Ruby

Aspose.Imaging Cloud API is an image processing solution to process images (photos) within your cloud or web applications. It offers: cross-platform Image processing, including but not limited to conversions between various image formats (including uniform multi-page or multi-frame image processing), transformations (resize, crop, flip&rotate, grayscale, adjust), advanced image manipulation features (filtering, deskewing), AI features (i.e. object detection and reverse image search). It’s a Cloud API and does not depend on any software for image operations. One can easily add high-performance image conversion features with Cloud APIs within projects. Flexible integrations options including SDKs for various languages (Python, Ruby, .NET, Java, NodeJS, PHP) and the use of the REST API allow to make the integration easy.

Convert DJVUs via Online App

Convert DJVU to JPG documents by visiting our Live Demos website. The live demo has the following benefits

  No need to download or setup anything
  No need to write any code
  Just upload your DJVU files and hit "Convert" button
  Instantly get the download link for the resultant file

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.

Read More

JPG What is JPG File Format

A JPEG is a type of image format that is saved using the method of lossy compression. The output image, as result of compression, is a trade-off between storage size and image quality. Users can adjust the compression level to achieve the desired quality level while at the same time reduce the storage size. Image quality is negligibly affected if 10:1 compression is applied to the image. The higher the compression value, the higher the degradation in image quality.

Read More

Other Supported Conversions

Using Ruby Cloud API, one can easily convert different formats including.

BMP (Bitmap Picture)
GIF (Graphical Interchange Format)
JPG (Joint Photographic Experts Group)
JPEG (Joint Photographic Experts Group)
JPEG2000 (JPEG 2000)
PSD (Photoshop Document)
TIFF (Tagged Image Format)
WEBP (Raster Web Image)
PNG (Portable Network Graphics)
DICOM (Digital Imaging & Communications)
PDF (Portable Document Format (PDF))
APNG (Animated Portable Network Graphics)
TGA (Targa Graphic)