How do you determine the dpi on a photo in a PDF document?

Many folks use Adobe's Acrobat to share reports, images, and video. Often times, we're asked to extract the images from a PDF file for use elsewhere. Depending on the downsampling settings, the images in a PDF might not work well outside of the document.

Here's how to check the resolution of the image within the PDF file.

If you have Acrobat Pro, you can use the Object Inspector in Output Preview to see the resolution of an image. Select View>Tools>Print Production>Output Preview, then change the Preview Type to Object Inspector and click on the image in question. Here's what you'll see.

223x452 @ 150 is like one of those old wallet photos we used to get with our school picture packages. It's not big. Some serious up-sizing will be needed if you want to use this image in a courtroom display.