[ptx] visible seams in a panaorama

[Rik Littlefield]

Jean-Luc,

I disagree that your "original pictures have not this vignetting".  I 
think they have very significant vignetting.

For example in img_03.jpg, Photoshop reports that the upper left corner 
has brightness 69%, the upper center has increased to brightness 80%, 
and the upper right is again decreased to 67%.

Instead of relying on enblend, you would get better results from 
correcting the vignetting first. 

In addition your img_01 file seems to be a bit overexposed compared to 
the others.

I played a bit using PTLens and Photoshop level adjust to correct these 
problems, then got pretty good results from enblend.

See http://www.janrik.net/PanoPostings/20050816/20050816a.html for examples.

I wonder if your earlier seamless pictures used more overlap, or 
different lens settings that gave less vignetting in your source images. 

Regards,
--Rik

Jean-Luc Coulon (f5ibh) wrote:

> Hi,
>
> I've done a panorama from 4 pictures.
> When sittched both with nona/enblend or PTStitcher then enblend, I 
> can  see some vignetting at the position where are located the overlaps.
>
> You can see what I mean at:
> http://jean.luc.coulon.free.fr/images/metabief_2.jpg
>
> The original pictures have not this vignetting, from left to right  
> (resized):
> http://jean.luc.coulon.free.fr/images/img_01.jpg
> http://jean.luc.coulon.free.fr/images/img_02.jpg
> http://jean.luc.coulon.free.fr/images/img_03.jpg
> http://jean.luc.coulon.free.fr/images/img_04.jpg
>
> Is there something I missed. I used to have seamless pictures.
>
> Regards
>
> Jean-Luc
>