>On Mon, Nov 29, 2010 at 6:14 PM, Ofnuts <ofn...@laposte.net> wrote:

>> On 11/30/2010 01:09 AM, Mark Phillips wrote:
>> > I followed the instructions for creating a panorama from 4 pictures in
>> > the Beginning Gimp book (Apres - AkkanaPeck) and it looks great except
>> > I have a dark vertical shadow where two of the images meet. How do I
>> > get rid of it? I am working on Linux Debian testing with Gimp 2.6.10.
>> >
>> > Briefly, this is what I did:
>> > 1. Make an new image a little larger than 4 X the width of one picture
>> > 2. Add first picture as a layer.
>> > 3. Add the second as another layer
>> > 4. Overlap image two over image one until they line up.
>> > 5. Add layer mask to image 2
>> > 6. Add gradient to layer mask - black to white from edge of second
>> > image to 3/4 of the way to edge of image 1
>> > 7. Repeat as needed for each new image
>> >
>> > By looking at the image, I would say the vertical band of darkness is
>> > the area of the gradient/overlap of the two images. I am a complete
>> > novice at this....
>> >
>> > Thanks!
>> >
>> > Mark
>> >
>> > P.S. I have also tried Hugin, which I could not get to work, and the
>> > gimp panorama plugin, which produce the same problem as above.
>>
>> Your shadow on the seam is caused by a general color mismatch between
>> the right part of the left image and the left part of the right one.
>> Creating panoramas requires to set the camera in manual mode to make
>> sure it won't change exposure parameters between the various shots. And
>> even once you have done that you still have shadow problems to sort out
>> because your photo has vignetting (slightly darker in the corners) and
>> the seam may be done between the border of a picture (dark) and a more
>> inner part of the next (slightly lighter). And this assumes of course
>> that you have got the geometry right, and corrected any tilt in the
>> pictures, etc...
>>
>> To make it short, assembling panoramas in Gimp is a lot of hard work.
>> The only pictures that aren't too hard to assemble in Gimp are those
>> from a flatbed scanner.
>>
>> Invest you time in making Hugin work. This will be a lot more rewarding
>> in the end.
>>

>Hmmm....that is very discouraging....the panorama from Gimp looks great,
>except for the two vertical black shadows where three pictures were joined.
>The sahdows are over water and sky.....Gimp is so powerful, I am surprised
>there isn't some way to get rid of them.

>Mark

>>
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>>

I think Hugin, especially the latest version is a great application and the web 
site has a fine selection of tutorials but going back to more basic stitching 
why not try the Pandora script.
It takes some but not all of the work out of joining images.  Still best to do 
as much prep as possible, straightening, rotating, adjusting colour.  Several 
tutorials around, this was my take on it. Appologies for it being a bit long 
winded.

http://www.youtube.com/watch?v=zBma6CT3mjY


-- 
rich (via gimpusers.com)
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