October 2nd, 2007
Darren over at digital-photography-school.com posted a tutorial that is if interest to RE photographers that are not using Photoshop CS3. The tutorial, called Stacking Images shot without a Tripod illustrated how to stack and align images using PTAssembler (shareware) or Hugin (free).
The problem is if you want to shoot several images so you can blend the sky from one image with the foreground of another image you need to have the two images perfectly registered (aligned pixel for pixel). There are several was to do this:
- You can shoot RAW and open the image twice once to get a properly exposed sky and a second time to get a foreground exposure. I know, there are many folks out there that choose not to shoot RAW.
- You can use a tripod and shoot bracketed images.
- You could use the PS CS3 auto align feature.
- You can use the technique described in the tutorial to align the images. The benefit of this technique is that it can be done with free software and no tripod.
Of all of these I still like 1. the best. With this technique you can extract multiple exposures many stops apart in exposure from one RAW image. When shooting panoramas when this technique is invaluable.