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Focus stacking – also called focal plane merging, z-stacking, [1] or focus blending – is a digital image processing technique which combines multiple images taken at different focus distances to give a resulting image with a greater depth of field (DOF) than any of the individual source images.
Free and open-source software portal; CombineZ is free image-processing software package for creating images with extended depth of field.It runs on Microsoft Windows.The current release is CombineZP (CombineZ-Pyramid), successor to CombineZM (CombineZ-Movie) which was based on CombineZ5 (designed for older versions of Windows and is no longer maintained).
Affinity Photo has been described as an Adobe Photoshop alternative, and is compatible with common file formats such as Adobe's PSD (including Photoshop Smart Objects). [9] [10] [11] Functionality includes RAW processing, color space options, live preview of effects, image stitching, alpha compositing, black point compensation, and optical aberration corrections. [2]
Helicon Focus is a proprietary commercial digital image processing tool, first released in 2003, developed and published by Helicon Soft Limited. Like programs such as CombineZ or Zerene Stacker, Helicon Focus is designed to blend the focused areas of several partially focused digital photographs to increase the depth of field (DOF) in an image.
The term "focus stacking", itself, does not imply uniqueness to digital, the references don't exclude the possibility of non-digital implementation, and they don't imply that it is always digital. Original work requiring focus stacking to be performed digitally seems to conflict with Wikipidia policy.
Drizzle (or DRIZZLE) is a digital image processing method for the linear reconstruction of undersampled images. The method is normally used for the combination of astronomical images and was originally developed for the Hubble Deep Field observations made by the Hubble Space Telescope.
The in-focus portions are then "stacked"; combined into a single image. Focus stacking is challenging, in that the subject (as in all brackets) must stay still and that as the focal point changes, the magnification (and position) of the images change. This must then be corrected in a suitable application by transforming the image.
Deep focus is a photographic and cinematographic technique using a large depth of field. Depth of field is the front-to-back range of focus in an image, or how much of it appears sharp and clear. In deep focus, the foreground, middle ground, and background are all in focus. Deep focus is normally achieved by choosing a small aperture.