Hugin hdrmerge

hdrmerge combines multiple overlapping images into a single HDRI (high dynamic range image). It is useful for combining multiple LDR images into a single HDR image. The input images should be in linear colorspace.

There are 2 merge modes available:

• Average: here the average of each pixel is calculated. Over and under exposure pixel are ignored.
• Khan: Here the Khan algorithm is used to reduce or eliminate in best case ghosts (e.g. moving objects in the different images).

Parameters

• -o|--output prefix: sets the filename for the output
• -v|--verbose: activates verbose output (for more details during processing).
• -h|--help: Shows the help
• -m mode: Sets the merge mode. Can be avg (default) or khan.

If the merge mode is average, the follow parameters can be used

• -c: Only consider pixels that are defined in all images.

The Khan algorithm can be fine tuned with

• -i iter: Sets the number of iterations to execute (default is 4).
• -s sigma: Sets standard deviation of Gaussian weighting function (sigma > 0); default: 30.
• -a set: Set advanced settings. Possible options are:
  • f: use gray images for computation. It's about two times faster but it usually returns worse results.
  • g: use gamma 2.2 correction instead of logarithm
  • m: do not scale image, NOTE: slows down process