I have a .pdf that I am trying to send to our printer which has a few color images in the manuscript. These few high resolution images are appearing to have a weird grid in them that was not present before. What is causing the appearance of this grid and how can I get rid of it?

pictures with grid boxes that shouldn't be there

Also, I pulled down the proof and looked at with Acrobat Pitstop combo and I am realizing that the images are quite massive. It's telling me that the image is a collection of images (each one in the grid box is a separate image that each have something like 900 x 900 px. Could this be relevant?
enter image description here

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    Is it bad to accidentally ask a duplicate question? Seems like one answer (yours) covered two different manifestations of a similar problem. But is this why the questions are now linked, to guide users to the solution but expanding the ways they could get there? – maxwell Jun 11 '15 at 18:57
  • Maxwell, it's not "bad" to ask a duplicate. It happens. Duplicates are closed to prevent repetitive content. If an answer has already been provided, there's not a great deal of value in repeating the answer. – Scott Jun 11 '15 at 19:00
  • In addition, others are always encourage to add answers to the original (duplicate) question. It just so happens in this case, no one else added an answer. But they still can. – Scott Jun 11 '15 at 19:14
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    Sure, sure - but does my question remain searchable and findable on the site / search engines? – maxwell Jun 12 '15 at 14:26