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9、Panorama 課程簡介
說明

 

PTGui Quick Toure    http://www.ptgui.com/examples/quicktour5/


PTGui can handle almost every kind of image, in any orientation. It is not required to keep the camera level, as you can see in this example. But for the best results remember the following:

  • All images should be taken from the same viewpoint
    When photographing, try to rotate the camera around the 'no parallax point' (the optical center of the camera/lens). Otherwise, parallax errors will occur, similar to the difference between the images you see with your left eye and right eye. This is less important if there are no objects near the camera (i.e. landscape scenes).
     
  • Lock the camera's exposure and white balance
    Although PTGui compensates for exposure differences, you will get the best results if there are no brightness or color differences in the images.

 

When you first run PTGui, only the Project Assistant tab will be visible. The project assistant guides you through a three step process. 

Press the 'Load images' button and open the 6 source images: 

Selecting the source images

Multiple images can be selected simultaneously by holding down the Ctrl key while clicking on a file name. Alternatively, images can be selected by dropping the files from (e.g.) Windows Explorer onto the PTGui window. 

The order of the images is not important at all. PTGui will find out in which way the images overlap in the next step. 

 

Next, press the 'Align images' button: 

Generating control points

PTGui analyzes all source images, looking for matching features in overlapping images. On matching features, control points are placed automatically. 

Finally, the images are aligned such that the control points coincide. The Panorama Editor window shows a preview of the final result. 

 

 

You can modify the orientation of the panorama using the Panorama Editor: 

Aligning the panorama

Use the left mouse button to move the panorama, or rotate the panorama using the right mouse button. 

The two sliders control the field of view of the panorama. 

The panorama can be cropped by dragging a yellow crop marker from the edge into the panorama. 

 

 

 

Finally, press the Create Panorama button to render the panorama at the desired size. 

Stitching

The result can be saved in several formats. It's even possible to create a layered Photoshop file, with each (warped) source image in a separate layer, perfect for post processing. 

 

 

The panorama has been stitched. In this case we have cropped and enhanced the contrast in a graphics editing program. Here's the result (click for larger version): 

Result after stitching with PTGui
If you have not done so, try PTGui yourself!

Further reading

The Tutorials section contains tutorials for more advanced use of PTGui and PTGui Pro. Also see Links for tutorials created by users of PTGui. 

PTGui comes with an on line help file, accessed through the Help menu in PTGui. In the Advanced mode, PTGui allows tweaking of every single parameter of a panorama; the help file gives a detailed explanation of each setting.

 

 

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