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Don't resize them in Illustrator. Resize them in Photoshop, then bring them back into Illustrator. Any time you resize like that you are losing data. Illustrator thinks in vectors, not pixels, you always want to edit a file in the appropriate program. In Photoshop, go to Image>Image size. Leave constrain proportions checked. Leave Resample unchecked, set your Resolution to 300. Click okay. Now reopen Image size, Select Resample image, use Bicubic sharper if necessary. Change your dimensions as needed, it's a good idea to leave Constrain proportions on or you will get some distortion in the image. Note also that when you are doing such resizing edits, you want to do them in the native Photoshop file, then save as a .jpg if necessary.Once you have resized the image, Save As and rename (however you want, for example [filename]Resize.jpg).Use this resized image in the Illustrator file.One other thing to note: it is possible that the image that is printing is not the actual image, but a placed thumbnail copy. This can also explain the problems you are having. Make sure the image is imbedded in the file, and not just linked.
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