Can I identify an image within PDF more easily instead of with object number?

Technical Support Apryse SDK
1

Hi there

As you see the attached file, I have a huge number of images, and I want a specific image to be replaced.

I understand using Swap of PDFTron allows for replacing images.

However, I would like to know how to identify or locate an image that is needed to be replaced so that there is no need for complicated process.

I already know Image Type and Object Number are to identify images within PDF.

But as they are created during the creation of PDF, I have to eventually extract images as object number at once and then replace object number in order to replace a specific image.

I would like to know if there is more convenient way to replace an image - for example, it seems better if I can assign a name for every image as I want when PDF is created.

Thank you.

Best Regards,

ImageReplacer.png

2

If you are creating the PDF, then you can add your own metadata to the image xobjects. See the following on how to add a custom key/value pair to XObject.

http://www.pdftron.com/pdfnet/intro.html#sdf_obj

In particular

`

// given image is a pdftron.PDF.Image object

image.GetSDFObj().PutName(“MyCustomKey”, “ImageGUID”);

`

Then to retrieve

Obj o = image.FindObj("MyCustomKey"); if(o != null) { string val = o.GetAsPDFText(); }