Convert DJVU to APNG via Java
Transform DJVU into APNG using native Java APIs without needing any image editor or 3rd-party libraries.
How to Convert DJVU to APNG Using Java
Converting file formats may seem like a routine task encountered by graphic designers. Yet, underestimating its significance would be a mistake. The evaluation of your work might depend on how swiftly and effectively you tackle this task. Typically, original images need conversion into formats better suited for printing or online publication. If the original image originates from a graphic editor, it might be in vector format. In this scenario, it must be rasterized and converted to a raster format for publishing purposes. You have the choice to save the image in an uncompressed format for optimal quality or convert it to a lossless compressed format to reduce file size. In certain contexts, like web publishing, you can opt for lossy compressed formats. Specially designed algorithms for image data compression permit a significant reduction in file size while preserving acceptable image quality. This facilitates fast image file downloads from the internet. In order to convert DJVU to APNG, we’ll use Aspose.Imaging for Java API which is a feature-rich, powerful and easy to use image manipulation and conversion 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.
Repository
<repository>
<id>AsposeJavaAPI</id>
<name>Aspose Java API</name>
<url>https://repository.aspose.com/repo/</url>
</repository>
Dependency
<dependency>
<groupId>com.aspose</groupId>
<artifactId>aspose-imaging</artifactId>
<version>version of aspose-imaging API</version>
<classifier>jdk16</classifier>
</dependency>
Steps to Convert DJVU to APNG via Java
Developers can easily load & convert DJVU files to APNG 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 APNG extension & object of ImageOptionsBase class
System Requirements
Before running the conversion example code, make sure that you have the following prerequisites:
- Operating system: Windows or Linux.
- Development environment: Supports .NET Core 7 and higher, such as Microsoft Visual Studio.
Free App to Convert DJVU to APNG
- Select or drag and drop DJVU image
- Choose format and click Convert button
- Click Download button to download APNG image
Check our live demos to convert DJVU to APNG
Convert DJVU to APNG - Java
import com.aspose.imaging.Image; | |
import com.aspose.imaging.ImageOptionsBase; | |
import com.aspose.imaging.fileformats.jpeg2000.Jpeg2000Codec; | |
import com.aspose.imaging.fileformats.png.PngColorType; | |
import com.aspose.imaging.fileformats.tiff.enums.TiffExpectedFormat; | |
import com.aspose.imaging.imageoptions.*; | |
//This example demonstrates how to convert all supported file formats from one to another | |
String templatesFolder = "D:\\WorkDir\\"; | |
//Formats that support both - save and load | |
HashMap<String, ImageOptionsBase> formatsThatSupportExportAndImport = new HashMap<String, ImageOptionsBase>(); | |
formatsThatSupportExportAndImport.put("bmp", new BmpOptions()); | |
formatsThatSupportExportAndImport.put("gif", new GifOptions()); | |
formatsThatSupportExportAndImport.put("dicom", new DicomOptions()); | |
formatsThatSupportExportAndImport.put("emf", new EmfOptions()); | |
formatsThatSupportExportAndImport.put("jpg", new JpegOptions()); | |
formatsThatSupportExportAndImport.put("jpeg", new JpegOptions()); | |
formatsThatSupportExportAndImport.put("jpeg2000", new Jpeg2000Options() ); | |
formatsThatSupportExportAndImport.put("j2k", new Jpeg2000Options() {{ setCodec(Jpeg2000Codec.J2K); }} ); | |
formatsThatSupportExportAndImport.put("jp2", new Jpeg2000Options() {{ setCodec(Jpeg2000Codec.Jp2); }} ); | |
formatsThatSupportExportAndImport.put("png",new PngOptions() {{ setColorType(PngColorType.TruecolorWithAlpha); }}); | |
formatsThatSupportExportAndImport.put("apng", new ApngOptions()); | |
formatsThatSupportExportAndImport.put("svg", new SvgOptions()); | |
formatsThatSupportExportAndImport.put("tiff", new TiffOptions(TiffExpectedFormat.Default)); | |
formatsThatSupportExportAndImport.put("tif", new TiffOptions(TiffExpectedFormat.Default)); | |
formatsThatSupportExportAndImport.put("wmf", new WmfOptions()); | |
formatsThatSupportExportAndImport.put("emz", new EmfOptions() {{ setCompress(true); }}); | |
formatsThatSupportExportAndImport.put("wmz", new WmfOptions() {{ setCompress(true); }}); | |
formatsThatSupportExportAndImport.put("svgz", new SvgOptions(){{ setCompress(true); }}); | |
formatsThatSupportExportAndImport.put("tga", new TgaOptions()); | |
formatsThatSupportExportAndImport.put("webp", new WebPOptions()); | |
formatsThatSupportExportAndImport.put("ico", new IcoOptions()); | |
//Formats that can be only saved | |
HashMap<String, ImageOptionsBase> formatsOnlyForExport = new HashMap<String, ImageOptionsBase>(); | |
formatsOnlyForExport.put("psd", new PsdOptions()); | |
formatsOnlyForExport.put("dxf", new DxfOptions() {{ setTextAsLines(true); setConvertTextBeziers(true); }} ); | |
formatsOnlyForExport.put("pdf", new PdfOptions()); | |
formatsOnlyForExport.put("html", new Html5CanvasOptions()); | |
//Formats that can be only loaded | |
List<String> formatsOnlyForImport = Arrays.asList("djvu", "dng", "dib", "eps", "cdr", "cmx", "otg", "odg"); | |
//Get total formats that can be saved | |
HashMap<String, ImageOptionsBase> exportToFormats = new HashMap<String, ImageOptionsBase>(formatsOnlyForExport); | |
exportToFormats.putAll(formatsThatSupportExportAndImport); | |
//Get total formats that can be loaded | |
List<String> importFormats = new LinkedList<>(formatsOnlyForImport); | |
importFormats.addAll(formatsThatSupportExportAndImport.keySet()); | |
importFormats.forEach((formatExt) -> { | |
String inputFile = templatesFolder + "template." + formatExt; | |
for (Map.Entry<String, ImageOptionsBase> exportFormat : exportToFormats.entrySet()) | |
{ | |
String outputFile = String.format("%s\\%s\\%s-%s-to-%s.%s", templatesFolder, "convert", "convert-", formatExt, exportFormat.getKey(), exportFormat.getKey()); | |
System.out.println(outputFile); | |
// More about load method can be found at | |
// https://apireference.aspose.com/imaging/java/com.aspose.imaging/Image#load-java.lang.String- | |
try (Image image = Image.load(inputFile)) | |
{ | |
ImageOptionsBase exportOptions = exportFormat.getValue().deepClone(); | |
if ((formatExt.equals("emf") || formatExt.equals("emz")) && (exportFormat.getValue() instanceof WmfOptions)) | |
{ | |
EmfRasterizationOptions rasterizationOptions = new EmfRasterizationOptions(); | |
rasterizationOptions.setPageWidth(image.getWidth()); | |
rasterizationOptions.setPageHeight(image.getHeight()); | |
exportOptions.setVectorRasterizationOptions(rasterizationOptions); | |
} | |
image.save(outputFile, exportOptions); | |
} | |
} | |
}); |
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 | DJVUAPNG What is APNG File Format
A file with .apng (Animated Portable Network Graphics) extension is a raster graphic format and is an unofficial extension to the Portable Network Graphic (PNG ). It comprises of multiple frames (each of PNG image) that represents an animation sequence. This gives similar visualization as a GIF file. APNG files support 24-bit images and 8-bit transparency. APNG is backward compatible with non-animated GIF files. APNG files use the same .png extension and can be opened by applications such as Mozilla Firefox, Chrome with APNG support, iMessage apps for iOS 10.
Read More | APNGOther Supported Conversions
Using Java, one can easily convert different formats including: