Picture Frame gives you the option of selecting a photo sequence from Flickr, Yahoo! Photos, or a folder in your computer's file system. You can navigate through photos or start a photo playback that changes at an interval you can set. The Find Current Image option opens Explorer or a browser for further information and display of the photo.
Choose Local Folder on your computer's file system, Flickr, or Yahoo! Photos for the setting Show Pictures From. If you choose Local Folder, leave the Default setting or click ... to provide the path for another folder and, optionally, folders enclosed by it.
An In Order setting of the Sort Pictures preference shows the pictures as they are ordered in the respective source.
You can choose the following change frequencies 1, 5, 15, 30, and 60 minutes. Note that while you can drag the bottom right corner to enlarge the Widget, the dimensions of the next photo resize the widget during photo playback.
Maximum Picture Size scales any dimension greater than this number either horizontally or vertically to keep the frame at the same approximate size.
As well as displaying the photos in no frame at all, you can choose the following frames: Black Lacquer, Light Wood, Dark Wood, Simple Shadow, and Inset. Inset is a frame that puts the surrounding pattern into the frame and then gives a drop shadow to the frame over the picture, giving the impression that the photo sits beneath the screen.
When the photo size changes from photo to photo, the Widget resizes. Four corner options relate the origin for the resizing to the current photo itself. A fifth option relates the origin for the resizing to the entire monitor display and where the Widget is placed in the display. This fifth option, Closest Corner, resizes the frame from whichever corner of the Widget that is closest to a corner of the display. As the size of the photos changes, the Closest Corner setting optimizes space on your desktop no matter where you put the Widget.
This standard tab is mostly self-explanatory. For more information about levels, see this article.