Whether to include all images in the analysis to allow the detection of orphans.
By default the ImageOperation will go through the pages defined in the PageContents looking at all the images that are used. However it is possible to include an image in a document yet never use it. This kind of orphan will not be detected using this method.
To allow the detection of orphans this property can be used to search the entire document and reference any image that exists. If such an image is an orphan this will be revealed because it will appear in the analysis as an ImageProperties item with no ImageRenditions.
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