Delete Image signatures from documents Leave feedback

GroupDocs.Signature provides ImageSignature class to manipulate image signatures and delete them from the documents over delete method.
Please be aware that delete method modifies the same document that was passed to constructor of Signature class, so the example below copies the signed document first and deletes the signature from the copy.

Here are the steps to delete Image signature from the document with GroupDocs.Signature:

• Create new instance of Signature class and pass source document path as a constructor parameter;
• Instantiate ImageSearchOptions object with desired properties;
• Call search method; the signatures property of the returned SearchResult holds the found ImageSignature objects;
• Select from list ImageSignature object(s) that should be removed from the document;
• Call Signature object delete method and pass one or several signatures to it; for a single signature it returns True when the signature was deleted.

This example shows how to delete Image signature that was found using search method. The sample presentation also has a picture of its own. With skip_external set to True, the search returns only the image signatures added by GroupDocs.Signature, so that picture is never passed to delete.

import shutil

from groupdocs.signature import Signature
from groupdocs.signature.options import ImageSearchOptions


def delete_image_signature():
    # delete() saves the changes into the opened document, so work on a copy
    shutil.copy("signed.pptx", "image_signature_deleted.pptx")

    with Signature("image_signature_deleted.pptx") as signature:
        options = ImageSearchOptions()
        # Return only signatures added by GroupDocs.Signature, not the slide's own pictures
        options.skip_external = True
        signatures = signature.search([options]).signatures
        print(f"Found {len(signatures)} image signature(s)")
        if not signatures:
            return

        image_signature = signatures[0]
        if signature.delete(image_signature):
            print(f"Deleted image signature at ({image_signature.left}, {image_signature.top}), "
                  f"{image_signature.size} bytes")
        else:
            print("Image signature was not deleted")


if __name__ == "__main__":
    delete_image_signature()

Binary file (PPTX, 142 KB)

You may easily run the code above and see the feature in action in our GitHub examples:

• GroupDocs.Signature for Python via .NET examples, plugins, and showcase

Along with the full-featured Python library, we provide simple but powerful free online apps.

To sign PDF, Word, Excel, PowerPoint, and other documents you can use the online apps from the GroupDocs.Signature App Product Family.