Tagging images for external color correction.

The company I work for has a client who requires us to provide a manifest of images that need color correction before printing in the PDF files we produce them.

That manifest has to refer to the actual object number that identifies those objects in the PDF files (eg the "obj" tag in the PDF spec.)

I would need some advice or ideas on how to accomplish that.

I started by looking for functions that return object numbers.  The only trick I found to retrieve an object number was to call GetObjectCount immediately after having added an image with AddImageFromFile.  That seemed to return the object number that is used in the PDF file.  Am I right in assuming this?

But to complicate things further, we are merging PDF files together before handing them to our customer.  The object numbers that I collected earlier don't survive a merge.

So I thought I could tag image objects with some metada just like what we can do today with SetDocumentMetadata, so I could recuperate that information after all our PDFs are merged. But I found nothing to do that.  Is it possible to add this functionnality?

Also, is it possible to add functions to navigate easily from image ID to object number in the PDF file?

Thanks in advance you for your time.

Are you referring to the Colourspaces and their definition.

Have you looked at the GetPageColorSpaces function.  It might be possible to add an obj number to the output of this function but I would need to know if this is what you are needing ?

Andrew.