Grayscale DJVU via Java Cloud API
Grayscale DJVU using native Java Cloud APIs without needing any image editor or 3rd-party libraries.
Get StartedHow to Grayscale DJVU Using Java Cloud API
Aspose.Imaging.Cloud for Java API which is a feature-rich, powerful and easy to use image manipulation and conversion Cloud API for Java platform. You can download its latest version directly from Maven and install it within your Maven-based project by adding the following configurations to the pom.xml.
pom.xml fragment
<repository>
<id>AsposeJavaCloudAPI</id>
<name>Aspose.Imaging Cloud Java SDK</name>
<url>https://repository.aspose.cloud/repo/</url>
</repository>
...
<dependency>
<groupId>com.aspose</groupId>
<artifactId>aspose-imaging-cloud</artifactId>
<version>version of aspose-imaging-cloud API</version>
<classifier>jdk16</classifier>
</dependency>
Steps to Grayscale DJVU via Java Cloud API
Developers can easily load & grayscale DJVU files in just a few lines of code.
- Load DJVU file as stream
- Create & set the instance of CreateGrayscaledImageRequest
- Call the CreateGrayscaledImage method
- Get grayscaled image from response stream
System Requirements
Aspose.Imaging Cloud for Java is supported on all major operating systems. Just make sure that you have the following prerequisites.
- JDK 1.6 or higher is installed.
Grayscale DJVU - Cloud
| import com.aspose.imaging.cloud.sdk.model.requests.CreateGrayscaledImageRequest; | |
| import com.aspose.imaging.cloud.sdk.model.requests.GrayscaleImageRequest; | |
| import java.nio.file.Files; | |
| import java.nio.file.Paths; | |
| string ImageFileName = "example_image.djvu"; | |
| string ImagesFolder = "ExampleImages"; | |
| string CloudFolder = "CloudImages"; | |
| string OutputFolder = "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/) | |
| ImagingApi api = new ImagingApi(argumentValues.ClientSecret, argumentValues.ClientId, "https://api.aspose.cloud"); | |
| /** | |
| * Grayscale an image from cloud storage. | |
| * | |
| * @throws Exception | |
| */ | |
| public void grayscaleImageFromStorage() throws Exception { | |
| // Upload image to cloud storage | |
| byte[] inputImage = Files.readAllBytes(Paths.get(ImagesFolder, ImageFileName)); | |
| UploadFileRequest request = new UploadFileRequest(Paths.get(CloudFolder, ImageFileName).toString(), image, null); | |
| FilesUploadResult response = api.uploadFile(request); | |
| if(response.getErrors() != null && response.getErrors().size() > 0) | |
| throw new Exception("Uploading errors count: " + response.getErrors().size()); | |
| String folder = CloudFolder; // Input file is saved at the desired folder in the storage | |
| String storage = null; // We are using default Cloud Storage | |
| GrayscaleImageRequest request = new GrayscaleImageRequest(ImageFileName, folder, storage); | |
| byte[] updatedImage = api.grayscaleImage(request); | |
| // Save the image file to output folder | |
| String updatedImageName = "changed_" + ImageFileName; | |
| Path path = Paths.get(OutputFolder, updatedImageName).toAbsolutePath(); | |
| Files.write(path, updatedImage); | |
| } | |
| /** | |
| * Grayscale an image. Image data is passed in a request stream. | |
| * | |
| * @throws Exception | |
| */ | |
| public void createGrayscaledImageFromRequest() throws Exception { | |
| byte[] inputStream = Files.readAllBytes(Paths.get(ImagesFolder, ImageFileName)); | |
| String outPath = null; // Path to updated file (if this is empty, response contains streamed image) | |
| String storage = null; // We are using default Cloud Storage | |
| CreateGrayscaledImageRequest request = new CreateGrayscaledImageRequest(inputStream, outPath, storage); | |
| byte[] updatedImage = api.createGrayscaledImage(request); | |
| // Save the image file to output folder | |
| String updatedImageName = "changed_" + ImageFileName; | |
| Path path = Paths.get(OutputFolder, updatedImageName).toAbsolutePath(); | |
| Files.write(path, updatedImage); | |
| } |
About Aspose.Imaging Cloud API for Java
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.
Grayscale DJVUs via Online App
Grayscale DJVU documents by visiting our Live Demos website. The live demo has the following benefits:
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 MoreOther Supported Conversions
Using Java Cloud API, one can easily grayscale different formats including: