When I create a PDF Export Preset under compression I can set the downlsampling PPI for images at or over a certain PPI e.g. Bicubic Downsamling to 300 pixels per inch for images above 450 pixels per inch.
When I place an image in a document I see the Actual PPI of the image and if I scale it or resize it I see an Effective PPI.
My question is, when I set the compression values does the exporter use the Actual PPI of the image or the Effective PPI once I've placed it and sized it as I want?
If downsamples based on the effective resolution since that is all that really counts in the PDF file.
In a PDF, the effective ppi is the actual ppi :)