How to remove an image resource from a PDF form

[Jurgen Doll]

Hi

I would like to know how to remove an image resource from a PDF form.
I use the following code to set an image object on a field:

    private static void setAppearance( PDDocument pdfDoc, PDField field,  
PDImageXObject image )
    {
        var widget = field.getWidgets().get(0);
        var rect = widget.getRectangle();

        var formObj = new PDFormXObject( new PDStream( pdfDoc ) );
        formObj.setResources( new PDResources() );
        formObj.setBBox( new PDRectangle
        (
            // The TransformationMatrix below enlarges the image slightly,
            // so adjust accordingly here otherwise the image is cropped.
            rect.getLowerLeftX(), rect.getLowerLeftY() - 10,
            rect.getWidth(), rect.getHeight() + 20
        ));
        formObj.setFormType(1);

        var appearanceStream = new PDAppearanceStream(  
formObj.getCOSObject() );
        var pageContentStream = new PDPageContentStream( pdfDoc,  
appearanceStream );
        pageContentStream.drawImage( image, getTransformationMatrix(  
image, widget ) );
        pageContentStream.close();

        var appearance = new PDAppearanceDictionary();
        appearance.setNormalAppearance( appearanceStream );
        appearance.getCOSObject().setDirect( true );
        widget.setAppearance( appearance );
    }

To remove the image I do "widget.setAppearance( null )" or to replace the  
image I use the above method to set the new image as the appearance.  
However I've noticed that this doesn't remove the previous image  
object/resource from the PDF. How do I go about removing it ?

Thanks, regards
Jurgen

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