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Photo Organizer's Bulk Update feature is one of its most powerful. It allows you to change the attributes of several of your images at once, using different search criteria:
Once you have chosen the set of images you wish to update, you must then chose what fields you wish to update. Next to each field is a checkbox; enable it if you wish the specified value to be applied to the specified images.
This will set the “author” field of all images to “Solomon Peachy”
The “set keywords” field will add the specified keywords to each image, while the “clear keywords” field will clear the specified keywords from each image. This way other keywords associated with each image will remain unaffected.
The bulk update feature allows you to regenerate the thumbnails and previews of your photos. This useful if you change parameters that affect preview generation, such as sharpening settings, watermarks, or image orientation or colorspace. Please note that the regeneration of your thumbnails and previews is very processor-intensive, and depending on your site settings the request may time out before it is complete.