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doc/filters/tiltandshift: apply typo fixes, add introductory description

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release/7.1
Stefano Sabatini 8 months ago
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commit 17a759cce1
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@ -23543,11 +23543,12 @@ tile=3x2:nb_frames=5:padding=7:margin=2
@end itemize @end itemize
@section tiltandshift @section tiltandshift
Apply tilt-and-shift effet.
What happens when you invert time and space? What happens when you invert time and space?
Normally a video is composed of several frames that represent a different Normally a video is composed of several frames that represent a different
instant of time and shows a scence that evolves in the space captured by the instant of time and shows a scene that evolves in the space captured by the
frame. This filter is the antipode of that concept, taking inspiration by frame. This filter is the antipode of that concept, taking inspiration by
tilt and shift photography. tilt and shift photography.
@ -23556,13 +23557,13 @@ and this is obtained by placing a slice of pixels from each frame into a single
one. However, since there are no infinite-width frames, this is done up the one. However, since there are no infinite-width frames, this is done up the
width of the input frame, and a video is recomposed by shifting away one width of the input frame, and a video is recomposed by shifting away one
column for each subsequent frame. In order to map space to time, the filter column for each subsequent frame. In order to map space to time, the filter
tilts each input frame as well, so that motion is preseved. This is accomplished tilts each input frame as well, so that motion is preserved. This is accomplished
by progressively selecting a different column from each input frame. by progressively selecting a different column from each input frame.
The end result is a sort of inverted parralax, so that far away objects move The end result is a sort of inverted parallax, so that far away objects move
much faster that the ones in the front. The ideal conditions for this video much faster that the ones in the front. The ideal conditions for this video
effect are when there is either very little motion and the backgroud is static, effect are when there is either very little motion and the backgroud is static,
or when there is a lot of motion and a very wide depth of field (eg. wide or when there is a lot of motion and a very wide depth of field (e.g. wide
panorama, while moving on a train). panorama, while moving on a train).
The filter accepts the following parameters: The filter accepts the following parameters:

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