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Combining three photos

Oct 7, 2012, 17:04 (This post was last modified: Oct 7, 2012 19:08 by AfTech54.)
Post: #1
Combining three photos
Hi!

This is a kind of ”HDR”-process done in just 8 small simple steps using GIMP. Once you've done it it will take you just a minut to complete it next time. I would be surprised if this is news for everyone, but for me it was (old and happy amateurBlush
What you need is three identical photos where each one has its own exposure – one normal(1), one under exposed(2) and the third over exposed(2). On my Canon 550D this is done with the EAB function. When the process is finished in GIMP the best exposures of each image will appear. The principle for the process is to use the fact that all dark areas in a layer mask will create transparency in the current layer.

   

1. Open GIMP and File – Open: image (1)
2. File – Open as Layer: image 2
3. Layers dialog (right click the layer 2) - Add layermask
4. Add mask to layer dialog, choose Grayscale copy of layer and klick Add
This mask will filter all dark shadows and make the layer transparent in those areas.
5. File – Open as Layer: image 3
6. Layers dialog (right click the layer 3) - Add layermask
7. Add mask to layer dialog, choose Grayscale copy of layer, mark ”Invert” and klick Add
This mask will filter all highligths and make the layer transparent in those areas. Try mode Normal or Addition.

   

8. Merge all visible layers.*
9. Done!!

   

10. Now you can threat and manipulate the image as one image and save it.

*Further more; before merging you can adjust levels (Color - Levels) for each layer mask as well as opacity (Layers dialog) for each layer to fine tune layers for the final image.

//Roger - Sweden
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Oct 7, 2012, 17:22
Post: #2
RE: Combining three photos
Not completely new but well explained Smile I'll just add that you can use "Levels" on the mask to adjust the participation of each layer.

There is an exposure-blend script that does a similar thing (but all these scripts require a bit of tuning, so you have better understand how they work anyway).

PS: on English-speaking Gimp, "Archive" is actually "File".

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Oct 7, 2012, 19:07
Post: #3
RE: Combining three photos
Thanks for your comment, Ofnuts!
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Oct 7, 2012, 22:08
Post: #4
RE: Combining three photos
(Oct 7, 2012 19:07)AfTech54 Wrote:  Thanks for your comment, Ofnuts!
On second thought there is something I strongly object to in your procedure: the "merge all layers" step. It is unnecessary since it is implicit when exporting the result, and makes further work impossible. If, at that point,you want to do global adjustments (color/sharpness) use "Layer/New from visible" to create a new layer and act on that one.

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Oct 8, 2012, 11:27
Post: #5
RE: Combining three photos
I agree, of course!
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