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PTGui is panoramic stitching software for Windows and Mac OSX. Originally developed as a Graphical User Interface for Panorama Tools (hence the name), PTGui now is a full featured photo stitching application. Use PTGui to stitch any number of photos into a panoramic image.

Some benefits of PTGui, when compared to other stitching software:

Automatic stitching: create panoramas with just a few mouse clicks
Manual mode: full control over the final result
Live preview: instantly see the effect of different settings, without the need to stitch first
Multi row panoramas: images can be stacked both horizontally and vertically
Many panoramic projections
Stitch rotated and tilted images
Create HUGE panoramas: stitch hundreds of images into multi gigapixel panoramas
Support for jpeg, tiff and png source images
Support for many camera RAW source images (through dcraw)
Create panoramas in jpeg, tiff or Photoshop format
Photoshop large document (.psb) support (output only)
Layered Photoshop output, ideal for retouching
Full support for 16 bit images, for the best image quality
Panorama editor: interactive adjustment of the panorama perspective
QTVR ouput: directly create interactive QuickTime VR panoramas, or convert an existing panorama into QTVR format
Support for multiple processors / multiple core computers
Create templates with frequently used settings
Batch stitcher: prepare your projects and send them to the batch stitcher for stitching when you are away from your computer
Batch Stitcher can generate control points and set up a panorama
Batch Builder: scan folders for panoramic source images and automatically create projects based on a template
Support for Batch Lists (save and load a list of jobs for the Batch Stitcher)
Stitch and blend HDR source images into an HDR panorama
Stitch and blend bracketed LDR source images into an HDR panorama
Calculate camera response curve from bracketed LDR source images
Built in tone mapper
Support for OpenEXR (.exr) and HDR Radiance (.hdr) source images
Blend Priority parameter (useful for blending the nadir image in a spherical panorama)
Viewpoint correction
Vignetting, exposure and white balance correction
Global adjustment of exposure and white balance
Exposure Fusion
64 bit version (Windows only)
Configurable Project Settings: control the behaviour of templates, custom default file names and more