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Help optimizing multiple pictures

Hi, I am a beginner in the world of digital pictures so please bear with me.
I have some pictures that I took on a recent trip to Spain. I used the panoramic function on my camera to take multiple pictures that I later stitched together using Hugin. The panoramics came out looking ok, but there are some differences in color between the pictures and it is clearly visible in the end product. When I say difference in color I mean the trees are a different shade of green between pictures, the sky is a different shade of blue, etc. I think this has something to do with the position of the sun and that I pivoted around to take the panoramic. Anyway, I tried adjusting levels, contrast, hue, saturation, brightness, etc for hours but I cant seem to get the colors to match. Does anyone know of a method or plug-in that could help me with this? I have included four pictures that make up one panoramic as an example. Thanks for reading.

AttachmentSize
pict0457_cp1.jpg2.17 MB
pict0458_cp2.jpg2.32 MB
pict0459_cp3.jpg2.72 MB
pict0460_cp4.jpg3.22 MB
Forums: 

This side is dedicated to (Extra) script and plugin for gimp
i suggest to ask this kind of question on a gimp forum as
http://www.gimptalk.com/forum/gimp-general-help-f2.html
or on the gimp group on Flickr http://www.flickr.com/groups/gimpusers/ or even on the gimpusers mail list.

In your case maybe the flickr gimpusers group may be the most adapt.
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as a quick attempt you may try to duplicate the layers and apply c2g "gegl operation" on the duplicates
..result will be in bw but if they match well, then you change duplicate layer mode in " value" to get back some colors..
.(you will then get more natural color duplicating again the
original layer and placing on top in overlay mode..but doing this you may introduce again some differences)
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But again for best answers ask in the right forum or group

I will try there.

I'd suggest using hugin http://hugin.sourceforge.net/ to stitch your photos.

This was the results with no tweaking, using the wizard:
http://www.majhost.com/gallery/ffaat/temp/test.jpg

It automatically tries to adjust the exposure based on the exif data and seam blending algorithms.

-Rob A>

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