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).
- -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