GroupDocs.Signature for .NET is a native .NET API to electronically sign digital documents using various signature types such as text, image, barcode, stamp, form-field, QR-code and metadata. Users can add, edit, verify, delete and search digital signatures within PDF, Microsoft Word, Excel worksheets, PowerPoint presentations, Adobe Photoshop, metafiles and image file formats with additional support for customizing signature properties as needed.
GroupDocs.Signature makes it easy for .NET developers to add image signatures to DjVu files within their applications by implementing a few easy steps.
GroupDocs.Signature for .NET APIs are supported on all major platforms and operating systems. Before executing the code below, please make sure that you have the following prerequisites installed on your system.
using (Signature signature = new Signature("sample.djvu"))
{
ImageSignOptions options = new ImageSignOptions("signature.jpg")
{
// set signature position
Left = 100,
Top = 100,
AllPages = true
};
signature.Sign("SampleSigned.djvu", options);
}
Add signatures to DjVu files right now by visiting GroupDocs.Signature Live Demos website.
The live demo has the following benefits
No need to download API
No need to write any code
Just upload the source file
Get download link to save the file
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. DjVu can be graded superior alternative to PDF. File extensions associated to DjVu are .DJVU or .DJV. DjVu can achieve compression ratios about 5 – 10 better than existing methods such as JPEG & GIF for colour documents and 3 – 8 times better than TIFF in black and white documents. Scanned documents at 300 DPI with full colour upto 25 MB can be compressed down to 30 to 100 KB. Similarly Black and white documents can be compressed upto 5 to 30 KB. Average HTML page can be up to 50 KB, therefore, these documents can be uploaded on net without any problem.
Read More About DjVu File Format.NET digital signatures management API for documents and images. Add image signatures to some of the popular file formats as stated below.
(Adobe Portable Document Format)
(Microsoft Word Document)
(Microsoft Word Macro-Enabled Document)
(Microsoft Word Open XML Document)
(Microsoft Word Document Template)
(Word Open XML Document Template)
(Microsoft Word Macro-Enabled Template)
(Rich Text Document)
(Open Document Text)
(OpenDocument Text Template)
(Microsoft Excel Binary File Format)
(Microsoft Excel Open XML Spreadsheet)
(Microsoft Excel Macro-Enabled Spreadsheet)
(Microsoft Excel Macro-Enabled Spreadsheet)
(Microsoft Excel Binary Worksheet)
(Microsoft Excel template)
(Microsoft Excel macro-enabled template)
(Open Document Spreadsheet)
(OpenDocument Spreadsheet Template)
(PowerPoint Presentation)
(PowerPoint Open XML Presentation)
(Microsoft PowerPoint 97-2003 Slide Show)
(PowerPoint Open XML Slide Show)
(Microsoft PowerPoint Macro-Enabled Template)
(Microsoft PowerPoint Template)
(Microsoft PowerPoint Presentation)
(OpenDocument Presentation)
(OpenDocument Presentation Template)
(WebP Image)
(Tagged Image File Format)
(JPEG Image)
(Graphics Interchange Format)
(Portable Network Graphic)
(Bitmap File Format)
(CorelDraw Vector Graphic Drawing)
(Scalable Vector Graphics)
(Adobe Photoshop Document)
(Windows Metafile)
(Enhanced Metafile Format)
(Corel Metafile eXchange Image)
(Deja Vu)
(Microsoft PowerPoint Macro-Enabled Slide Show)
(Digital Imaging and Communications in Medicine)
