Creates and saves an HDR image, in EXR format, from a collection of images. If
the input images are 16-bit linear TIFFs (as created by dcraw), use the
"linear" option.

Nonlinear image files are merged using a modified version of:
	Paul Debevec and Jitendra Malik. "Recovering High Dynamic Range
	Radiance Maps from Photographs". Proceedings of the 24th annual
	conference on computer graphics and interactive techniques. Pages
	369-378. 1997.
Linear TIFFs are merged using a different (but related) algorithm, for which
the "stops", "lambda" and "epsilon" arguments are ignored.

The stops parameter is self-explanatory. Lambda controls the smoothness of the
response curves which are recovered. This term is scaled in proportion to the
number of pixels which are used in determining these response curves and
exposure settings (this is the "pixels" parameter), so when using more pixels,
it may be advisable to decrease lambda. Finally, epsilon is the termination
threshold. If you're getting unsatisfactory results, and suspect that the
reason for this is that a poor-quality solution is being found, then decreasing
epsilon (or increasing the number of pixels) might help. Conversely, if you are
satisfied with the solution, but want the program to run more quickly, then
increasing epsilon (or decreasing the number of pixels) could be a good idea.
One warning: if epsilon is too small, then the solution may never converge, and
you'll need to abort this program.

Usage: hdr_create.exe [OPTION...] [INPUTS...]
  -h, --help                       show help
  -4, --linear                     are the input files 16-bit linear TIFFs?
  -o, --output=OUTPUT              output file (EXR)
  -p, --pixels=FLOAT(=10000)       how many pixels should we use?
  -s, --stops=FLOAT                stops spanned by images
  -l, --lambda=FLOAT(=1)           lambda parameter
  -e, --epsilon=FLOAT(=0.0001)     epsilon parameter