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A watermark is placed on an image for 3 reasons: . 1. To protect the image from being stolen, used and credited by someone else. 2. To deter clients from attempting to grab and print images pulled directly from your site.
The two watermarking functions are Doc.addWatermarkFromFile() and Doc.addWatermarkFromText(). There are only two differences between these functions. First, one uses a text string as the source for the watermark content, and the other uses an image or PDF file. The second difference is in how the functions operate.