It takes a few steps to make a picture your publication background, but if you use master pages you have to make the change only once and all of the publication pages will have the full-page background.
If a full-page background isn’t what you want, you can make a smaller watermark from a photo or picture or create a text watermark.
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Open your publication template, and click Page Design > Master Page > Edit Master Pages.
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Click Page Design > Background> More Backgrounds.
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Click Picture or texture fill.
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Click File, choose your picture, and click Insert.
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In the Format Background box, under Transparency, type 80% in the box, and click OK.
If you want to make the picture even lighter, move the slider to 85% or 90%.
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Click Master Pages > Close Master Pages to return to the publication.
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