Edit zenith and nadir in one go with PTGui

General

Here I show you a fast way to retouch zenith and nadir in one go.
Use this methos only if you have a proper stitched panorama and only
the most up (zenith) and down (nadir) area needs some retouching.
Otherwise use other technics as described under
Extracting and inserting rectilinear Views and How to use PTEditor.

Workflow

Remap to zenith and nadier view

Open PTGui and add one spherical panorama. As you can see the source pano is 6000 x 3000 pixels in size:





Under Lens Setting tab add the yellow highlighted values:





Under Panorama Settings tab add the yellow highlighted values:





Under Image parameters tab add the yellow highlighted values and you can see imediately the remapping of the image:





Enable Lock aspect ratio, press Set optimum size button and compare the values with the original size of the panorama.
Choose as output file format TIFF (.tif) for fewer quality loss. Press Create Panorama! to start remapping process:





You don't have to add controlpoints and optimize in this case so press OK.





Now you can see the known progress bar of Panotools:

Retouching zenith and nadir in one go

Here you see the remapped panorama opened in Photoshop. The yellow circles marks zenith and nadir as nearby flat region.
It is now much easier to retouch these regions.

Remapping back to nermal view

Open the retouched panorama again in PTGui with the same values under Lens Settings and Panorama Settings.
Fill in the yellow highlighted values under Yaw and Roll.
The Warped view changes imediately to the oroginal projection.





Change the values as below, alter output file name to your needs and press Create Panorama!


If you want the best possible quality follow the next steps, otherwise you are done here.

Merging with most quality

Open the retouched, spherical pano in Photoshop and take a look at layer palette.
Drag and drop background layer over new layer icon to make a copy of it:





Here you can see an additional layer as copy of the bachgroud.
Now drag and drop background layer over recycle bin at the bottom of the
layer palette to delete it:





Rename the existing layer to zenith and nadir by double clicking on its layer name:





Choose Marquee Tool and fill in a feather of 40:





Set the grid under Edit > Preferences > Guides, Grids & Slices > Gridline every to 50%
and Subdivison to 1. Left clic at the grid cross in the middle of the pano and drag the selection
square to the most right side by holding Alt key until it looks like the image below and then release left
mouse button:





Press Delete key that only zenith and nadir region of the retouched pano will stay:


To delete the rectangle selection press Ctrl+D.




Open the original pano. Select the retouched pano press Ctrl+A to select the whole image.
Change to Move Tool and drag and drop the retouched pano over the original
pano by holding Shift key to align it proper.





Now in the original file you can see two layers, the original background layer and
on top the dropped layer.





Flatten these layers to background under Layer > Flatten Image :





You are done now but don't forget to save the panorama with a different name:





Peter Nyfeler (Pitdavos)