Flipped image
Encyclopedia
A flipped image or reversed image, the more formal term, is a static or moving image that is generated by a mirror-reversal of an original across a horizontal axis. Many printmaking
Printmaking
Printmaking is the process of making artworks by printing, normally on paper. Printmaking normally covers only the process of creating prints with an element of originality, rather than just being a photographic reproduction of a painting. Except in the case of monotyping, the process is capable...

 techniques produce images where the printed copy is reversed from the image made on the printing plate, so in a print copying another image, or a real scene or object, unless the artist deliberately creates the plate as a mirror-image of his subject, the finished print will be a mirror image of it. Many print makers developed the skill of reversing images when making printing plates, but many prints, especially early ones, have images that are reversed.

Photography

Many large format cameras present the image of the scene being photographed as a flipped image through their viewfinders. Some photographers regard this as a beneficial feature, as the unfamiliarity of the format allows them to compose the elements of the picture properly without being distracted by the actual contents of the scene. The technique is meant to bypass or override the brain's visual processing which normally sees what is expected rather than what is there.

Flipping is occasionally used as a trompe l'oeil
Trompe l'oeil
Trompe-l'œil, which can also be spelled without the hyphen in English as trompe l'oeil, is an art technique involving extremely realistic imagery in order to create the optical illusion that the depicted objects appear in three dimensions.-History in painting:Although the phrase has its origin in...

 effect in scenes which incorporate reflections in a body of water. The image is deliberately inverted so that people slowly discern that something is 'not quite right' with the picture, and come to notice that it is upside down.

Flip chart
Flip chart
A flip chart is a stationery item resembling a whiteboard, typically supported on a tripod or four-legged easel. A pad of paper sheets is typically fixed to the upper edge. Such charts are commonly used for presentations. The flip chart is thought to have been invented by Peter Kent who built one...

s are so called because the sheets of paper are secured on a horizontal axis and flipped to reveal the next sheet in succession.

Other transforms

Flipping is regarded as a basic image transform, along with flopping (a mirror image across a vertical axis) and cropping
Cropping (image)
Cropping refers to the removal of the outer parts of an image to improve framing, accentuate subject matter or change aspect ratio. Depending on the application, this may be performed on a physical photograph, artwork or film footage, or achieved digitally using image editing software...

, all of which can easily be done physically with a photographic negative in a darkroom. More sophisticated transforms are usually achieved via digital image manipulation.
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