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Images dpi changes after pdfing from Indesign CS4

Hello all,
I have an image saved as a CMYK .eps at a resolution of 300dpi
which I have placed into an Indesign CS4 document and then scaled up to 200%

I then pdf's the document.

Now upon opening the pdf and Selecting the Preflight option I get an error on the image saying it's only 150dpi.

How could this have happened?

It's because you've scaled the image 200% - if the size of the image is increased, the dpi decreases.

You can't scale a 300dpi raster image and expect it to retain its resolution of 300dpi.

Look up the term 'interpolation'.