Photoshop is a very powerful program that takes years to master. A complete discussion of the techniques used to fix panos is beyond a simple answer in a post.
First, I recommend you get a good book on the subject. There are several books geared toward digital photography and the use of photoshop in post production. These books will explain the use of tools and methods of interest to the digital photographer. These methods apply directly to fixing panos.
Until then you can look up the use of the following tools in photoshop. Clone tool Patch tool Healing brush
The Clone tool is what you will use the most followed by the patch tool. Look up these two tools becasue they will be what you use most often for seam patching.
Often you can "select" areas of your image and cut/paste back onto the same image. Move the copied selection over a seam area and transform it by stretching or skewing it to cover a seam. You will some times need to clone the edges of the selection to hide the seam of that but this is sometimes better than cloning a whole area. Just depends.
Look up "adjustment layers". You use these to apply color correction layers that you can change as needed to make hemis match. Specifically, you will use the "levels" command to alter the brightness/darkness of an image and you will use "color balance" to change the color tones. If you use an adjustment layer for these changes you can go back later and alter the setting without having to reload the image and do it over again each time.
Also check this link out. It has several tutorials of use. Look at the "enhancing photos" tutorial. And especially the "removing people" quicktime movie. This movie explains how to clone and use selections to remove things like seams. http://www.designsbymark.com/freetips/index.html
Gen. Lee
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