[ptx] visible seams in a panaorama

[Rik Littlefield]

>>For example in img_03.jpg, Photoshop reports that the upper left
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>corner 
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>>has brightness 69%, the upper center has increased to brightness 80%, 
>>and the upper right is again decreased to 67%.
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>How do you check this exactly and how could I remove vignetting from
>pictures? (GIMP?)
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I don't use GIMP very much and don't have a clue how to do it there.  
Perhaps others can answer.

In Photoshop, to determine the brightness, just look in the "Info" panel 
while running a cursor over the image.  The Info panel is a tab in a 
small dialog window along with Navigator and Histogram.  It can be made 
visible by menu entry Window | Info.  It can be set to show continuously 
any of several descriptions of the pixel under the cursor, including 
RGB, HSB, CMYK, etc.  I just reported the "B" value in HSB.

To remove the vignetting, I used Thomas Niemann's PTLens plugin for 
Photoshop, with settings "amount=16, midpoint=0", those values 
determined by repeated trials, checking the result as described above 
and by looking at the result of a PTGui/enblend stitch.  I presume that 
the earlier Panorama Tools plugin Correct could do the same job, but 
PTLens has a good preview that saves some work.  One frame, img_01 was 
also brighter than the others and required some level adjustment to match.

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>>See http://www.janrik.net/PanoPostings/20050816/20050816a.html for
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>examples.
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>Your pictures are linked to local files on your harddrive, we can't
>access them ;)
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Fixed...thanks for letting me know.  Netscape Composer strikes again -- 
its drag-and-drop always defaults to absolute path, not relative, and I 
forgot to hit the checkbox to force it relative.

--Rik

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