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align_image_stack − Align overlapping images for HDR or focus stack creation


align_image_stack [options] input files


align_image_stack is used for the alignment of slightly misaligned images. 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:

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



Verbose, print progress messages. Repeat for higher verbosity


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)


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


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

−c num

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


Assume linear input files

−s scale

Scale down image by 2^scale (default: 1 [2x downsampling])

−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])


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.

This manpage was written by Cyril Brulebois <cyril.brulebois@enst−> and is licensed under the same terms as the hugin package itself.