Watermark / Using Watermark with Legacy Images
Auto-watermarking is not possible with legacy images because Miva Merchant doesn't notify modules when legacy images are added. However that doesn't mean you can't save time and use watermark.
To watermark product images as products are displayed, put this somewhere before the image is displayed:
<mvt:do file="'/mm5/5.00/modules/util/watermark.mvc'" name="l.ok" value="watermark_write(l.settings:product:image)" />
If the image is not watermarked, the module will take care of it. If the image is watermarked the module will ignore it.