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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.
CombineZ processes a stack of images (or frames) and is most frequently used to blend the focused areas of several partially focused digital photographs, usually close-ups, in order to create a composite image with an extended depth of field, created from the in-focus areas of each image.
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.
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]
This initial release (version v1.0.0) had facilities for stack alignment, grading and selection of the images to be merged, and image enhancement using techniques such as wavelet processing. [ 9 ] [ 10 ] The program was regularly updated by its author and on 6 June 2004 a multi-lingual version was begun (v3) and the program was later available ...
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.
Image fusion based on the multi-scale transform is the most commonly used and promising technique. Laplacian pyramid transform, gradient pyramid-based transform, morphological pyramid transform and the premier ones, discrete wavelet transform, shift-invariant wavelet transform (SIDWT), and discrete cosine harmonic wavelet transform (DCHWT) are some examples of image fusion methods based on ...
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.