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       align_image_stack - Align overlapping images for	HDR or focus stack

       align_image_stack [options] input files

       align_image_stack is used for the alignment of slightly misaligned
       images or for the registration of a stereo images pair.	When several
       differently exposed images are taken in the process of creating a High
       Dynamic Range image, the	images are not perfectly aligned, and the
       quality of the HDR image	created	will suffer from this.
       align_image_stack uses the tools	available to hugin to optimize the
       roll, pitch and yaw, as well as some parameters of the lens geometry,
       to align	the images.

       Modes of	operation:

       -p file
	   Output .pto file (useful for	debugging, or further refinement)

       -a prefix
	   Output aligned images as prefix_xxxx.tif

       -o output
	   Align images	and merge them to HDR, generate	output.hdr


       -v  Verbose, print progress messages. Repeat for	higher verbosity

       -e  Assume input	images are full	frame fish eye (default: rectilinear)

       -t num
	   Remove all control points with an error higher than num pixels
	   (default: 3)

	   Correlation threshold for identifying control points	(default: 0.9)

       -f HFOV
	   Approximate horizontal field	of view	of input images, use if	EXIF
	   info	not complete

       -m  Optimize field of view for all images, except for first. Useful for
	   aligning focus stacks with slightly different magnification.

       -d  Optimize radial distortion for all images, except for first.

       -i  Optimize image center shift for all images, except for first.

       -x  Optimize X coordinate of camera position

       -y  Optimize Y coordinate of camera position

       -z  Optimize Z coordinate of camera position

       -S  Assume stereo images	- allow	horizontal shift of control points.

       -A  Align stereo	window - assumes -S

       -P  Align stereo	window with pop-out effect - assumes -S

       -C  Auto	crop the image to the area covered by all images

       -c num
	   Number of control points (per grid) to create between adjacent
	   images (default: 8)

       -l  Assume linear input files

       -s scale
	   Scale down image by 2^scale (default: 1 [2x down-sampling])

       -g gsize
	   Break image into a rectangular grid (gsize x	gsize) and attempt to
	   find	num control points in each section (default: 5 [5x5 grid])

	   Try to load distortion information from lens	database

	   Use the image order as given	on the command line.  (By default
	   images will be sorted by exposure values.)

	   Use GPU for remapping

       -h  Display help	summary.

       Written by Pablo	d'Angelo. Also contains	contributions from Douglas
       Wilkins,	Ippei Ukai, Ed Halley, Bruno Postle, Gerry Patterson and Brent
       Townshend.  Stereo functionality	added by Vladimir Nadvornik.

       This man	page was written by Cyril Brulebois
       <>, updated by Terry Duell, and is
       licensed	under the same terms as	the hugin package itself.

"Version: 2019.2.0"		  2015-10-25		  ALIGN_IMAGE_STACK(1)


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