Add watermarks to webpage photos
You can add a graphics file to your photos as a watermark to discourage others from using your photos without your permission. Watermarks are especially useful when applied to photos posted on the web.
Use the following guidelines to create high-quality watermarks for your photos:
Save your watermark as a Photoshop (.psd) file with a transparent background.
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Create multiple sizes of your watermark so that you can select the one that best matches the output size of the exported photo.
Note: If a watermark file is larger than the photo you want to export, Aperture automatically scales the watermark down to fit the photo. (Aperture doesn’t scale watermarks up.)
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After you create a watermark, save it as part of a web export preset so that you can reuse it.
Note: Export presets and web export presets are independent of one another. Make sure to save your watermark as part of the appropriate preset.
Create a preset that adds a watermark to your exported web photos
Choose Aperture > Presets > Web Export.
In the Web Export dialog, select the web export preset you want to modify, or click the Add button (+) to create a new preset.
Select the Show Watermark checkbox.
Click the Choose Image button.
Select the image you want as a watermark, and click Choose.
Choose where you want the watermark to appear on the photo from the Position pop-up menu.
To adjust the opacity of the watermark, drag the Opacity slider.
When you’re satisfied with how your watermark appears in the watermark preview area, click OK.