image enhancement

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Image Stacking software

Registax

Autostakkert

PanoTools

Hugin

Enblend and Enfuse

PetaPixel

Some use cases for image stacking software:

  1. Align channels to correct for for chromatic aberration or pixel offset parallax (image sensor color channels have a vertical offset, so pixels on one edge of sensor will have colors shifted relative to the pixels on the opposite side of the sensor).
  2. Align exposure bracketed shots to create a HDR image.
  3. Align focus depth bracketed shots to create extended Depth of Field image. Also called 'Focus Stacking.

Algorithms

MAP-uHMT algorithm