Preflight image DPI check doesn't show images but "boxes"

[graceful_magnificence5C22]

I want to check if my images have enough DPI. So I used preflight with the profile "List page objects, grouped by type of object". But when I let preflight show me the objects with for example less than 100 dpi

it gives me a dozen "boxes" (as shown below) instead of refering to the image. Is that normal? So preflight checks the PDF in boxes rather than from image to image?

 

[Test Screen Name]

No, it checks from image to image. This means that the PDF creation tool/app divided your large image into smaller images. THIS is common, and not a problem.

[graceful_magnificence5C22]

Thank you for your answer! Is there a specific export option in Illustrator/Indesign or does this division into smaller images always happen?