Image Resolution
Images with a resolution less than 300 dpi will reproduce poorly on press and result in an image that looks fuzzy and/or pixilated.
Remember 300 dpi is the minimum resolution in most cases. If you took your images from a website, there is a good chance that they will not be at a high enough resolution for printing (unless the images came from a stock photography source and are designated as high resolution). The internet displays images at 72 dpi which is only a quarter of the resolution that you need. These images should not be used for commercial offset printing. They are not large enough to reproduce properly. As a general rule of thumb Large images can be scaled down but small images should never be scaled up in size. If an image starts out small there is no way to increase its number of pixels with out degrading the image.
Following diagram to show printing matter final result.

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