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A clipping path (or "deep etch") is a closed vector path, or shape, used to cut out a 2D image in
image editing Image editing encompasses the processes of altering images, whether they are digital photographs, traditional photo-chemical photographs, or illustrations. Traditional analog image editing is known as photo retouching, using tools such as a ...
software. Anything inside the path will be included after the clipping path is applied; anything outside the path will be omitted from the output. Applying the clipping path results in a hard (aliased) or soft (anti-aliased) edge, depending on the image editor's capabilities By convention, the inside of the path is defined by its direction. Reversing the direction of a path reverses what is considered inside or outside. An ''inclusive path'' is one where what is visually "inside" the path corresponds to what will be preserved; an ''exclusive path'', of opposite direction, contains what is visually "outside" the path. By convention, a clockwise path that is non-self-intersecting is considered inclusive. A compound path results from the combination of multiple paths (inclusive and exclusive) and the Boolean operations that ultimately determine what the combined path contains. For instance, an inclusive path which contains a smaller exclusive path results in a shape with a "hole" (defined by the exclusive path). One common use of a clipping path is to cull objects that do not need to be rendered because they are outside the user's
viewport A viewport is a polygon viewing region in computer graphics. In computer graphics theory, there are two region-like notions of relevance when rendering some objects to an image. In textbook terminology, the '' world coordinate window'' is the area ...
or obscured by display elements (such as a
HUD Hud or HUD may refer to: Entertainment * ''Hud'' (1963 film), a 1963 film starring Paul Newman * ''Hud'' (1986 film), a 1986 Norwegian film * ''HUD'' (TV program), or ''Heads Up Daily'', a Canadian e-sports television program Places * Hud, Fa ...
).


In 3D graphics

Clipping
plane Plane(s) most often refers to: * Aero- or airplane, a powered, fixed-wing aircraft * Plane (geometry), a flat, 2-dimensional surface Plane or planes may also refer to: Biology * Plane (tree) or ''Platanus'', wetland native plant * ''Planes' ...
s are used in
3D computer graphics 3D computer graphics, or “3D graphics,” sometimes called CGI, 3D-CGI or three-dimensional computer graphics are graphics that use a three-dimensional representation of geometric data (often Cartesian) that is stored in the computer for t ...
in order to prevent the renderer from calculating surfaces at an extreme distance from the viewer. The plane is perpendicular to the
camera A camera is an optical instrument that can capture an image. Most cameras can capture 2D images, with some more advanced models being able to capture 3D images. At a basic level, most cameras consist of sealed boxes (the camera body), with a ...
, a set distance away (the ''threshold''), and occupies the entire viewport. Used in real-time rendering, clipping planes can help preserve processing for objects within clear sight. The use of clipping planes can result in a detraction from the realism of a scene, as the viewer may notice that everything at the threshold is not rendered correctly or seems to (dis)appear spontaneously. The addition of ''fog''—a variably transparent region of color or texture just before the clipping plane—can help soften the transition between what should be in plain sight and
opaque Opacity or opaque may refer to: * Impediments to (especially, visible) light: ** Opacities, absorption coefficients ** Opacity (optics), property or degree of blocking the transmission of light * Metaphors derived from literal optics: ** In lingu ...
, and what should be beyond notice and fully
transparent Transparency, transparence or transparent most often refer to: * Transparency (optics), the physical property of allowing the transmission of light through a material They may also refer to: Literal uses * Transparency (photography), a still, ...
, and therefore does not need to be rendered.


Clipping path service

Clipping path services are professional offerings provided by companies for extracting objects or people from still imagery, and typically includes other photo editing and manipulation services. Addressees of such services are primarily photography and graphic design studios, advertising agencies, web designers, as well as lithographers and printing companies. Clipping path service companies commonly reside in
developing countries A developing country is a sovereign state with a lesser developed industrial base and a lower Human Development Index (HDI) relative to other countries. However, this definition is not universally agreed upon. There is also no clear agreem ...
such as
Bangladesh Bangladesh (}, ), officially the People's Republic of Bangladesh, is a country in South Asia. It is the eighth-most populous country in the world, with a population exceeding 165 million people in an area of . Bangladesh is among the mos ...
,
Philippine The Philippines (; fil, Pilipinas, links=no), officially the Republic of the Philippines ( fil, Republika ng Pilipinas, links=no), * bik, Republika kan Filipinas * ceb, Republika sa Pilipinas * cbk, República de Filipinas * hil, Republ ...
,
India India, officially the Republic of India (Hindi: ), is a country in South Asia. It is the seventh-largest country by area, the second-most populous country, and the most populous democracy in the world. Bounded by the Indian Ocean on the so ...
,
Pakistan Pakistan ( ur, ), officially the Islamic Republic of Pakistan ( ur, , label=none), is a country in South Asia. It is the world's fifth-most populous country, with a population of almost 243 million people, and has the world's second-lar ...
and
Nepal Nepal (; ne, :ne:नेपाल, नेपाल ), formerly the Federal Democratic Republic of Nepal ( ne, सङ्घीय लोकतान्त्रिक गणतन्त्र नेपाल ), is a landlocked country in S ...
, which can provide their services at comparatively low cost to developed countries, fostering outsourcing of such activities.


See also

*
Silhouette A silhouette ( , ) is the image of a person, animal, object or scene represented as a solid shape of a single colour, usually black, with its edges matching the outline of the subject. The interior of a silhouette is featureless, and the silhou ...


References

{{reflist Digital art