Welcome, USA Today readers! For this week, PanoLab Pro is available for $2.99, down from the usual price of $4.99.

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PanoLab Pro is an advanced tool for creating multi-frame panoramas on the iPhone. PanoLab Pro uses the same intuitive, multi-touch interface as the free version of PanoLab, but also includes powerful new features for creating high-quality compositions. PanoLab Pro's exclusive features include:

- Document saving: save any number of in-progress panoramas for editing or showing off in 3D
- Export options: export panoramas in a wide range of aspect ratios and resolutions, from 640x480 to 1920x1080
- Exposure adjustment: adjust the exposure and white balance of individual photos, or let PanoLab do it automatically

Unlike collage applications, PanoLab applies perspective correction and linear projection to make many photos from one viewpoint align into a cohesive wide-angle view.

Unlike other panorama applications available for iPhone, PanoLab joins photos both vertically and horizontally, and can combine as few as 2 or as many as 30 images.

See what other photographers are doing with PanoLab and PanoLab Pro at http://panolab.tumblr.com/ and http://www.flickr.com/groups/panolab/.