Is there a reliable way to determine if the content of a page is a jpeg image?

I have a need to readily detect that the content of a particular page is a JPEG image.......
Is there a way to ascertain this as I am processing each page ?

I see - something more like the following code ? -
Thanks Leonard - I can see that this will take a while but - it is good to know that I am on the right path to start out.
I suppose that I can use the dump type to see what a jpeg looks like , etc.
Thanks again .
AVDoc avDoc = AVAppGetActiveDoc();
AVPageView pageView = AVDocGetPageView(avDoc);
PDPageNumber pageNum = AVPageViewGetPageNum(pageView);
/* Bridge method to PD doc*/
PDDoc pdDoc = AVDocGetPDDoc(avDoc);
/* Acquire current page */
PDPage pdPage = PDDocAcquirePage(pdDoc, pageNum);
PDEContent pdeContent = PDPageAcquirePDEContent(pdPage, gExtensionID);
//Declare a PDEElement object
PDEElement pdeElement;
//Get the number of elements in the PDEContent object
ASInt32 eleNum = PDEContentGetNumElems(pdeContent);
//Get each element in the PDEContent object
for (int j=0; j<eleNum; j++){
     pdeElement = PDEContentGetElem(pdeContent, j);
//Determine if the element is a the type that we are looking for     if (PDEObjectGetType((PDEObject)pdeElement) == MatchingType
     //Perform a required action

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Is there a reliable way to determine if the content of a page is a jpeg image?

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