Check if an image is rasterized

Can someone please tell me how I can check if an image is rasteri开发者_StackOverflowzed using Adobe Acrobat Pro?

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From within Acrobat right-click the image in question and select "Properties":

If you can't tell by the image description in properties... in the left-hand menu is the image type descriptor. In this pane you can see this image was originally TIFF. Any image format (jpg,gif,tiff,png) will be considered 'raster'.