From 17a759cce13b5d9562c8b9c07e0cf603292a44b2 Mon Sep 17 00:00:00 2001 From: Stefano Sabatini Date: Mon, 3 Jun 2024 11:07:27 +0200 Subject: [PATCH] doc/filters/tiltandshift: apply typo fixes, add introductory description --- doc/filters.texi | 9 +++++---- 1 file changed, 5 insertions(+), 4 deletions(-) diff --git a/doc/filters.texi b/doc/filters.texi index f5bf475d13..766b662ebe 100644 --- a/doc/filters.texi +++ b/doc/filters.texi @@ -23543,11 +23543,12 @@ tile=3x2:nb_frames=5:padding=7:margin=2 @end itemize @section tiltandshift +Apply tilt-and-shift effet. What happens when you invert time and space? 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 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 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 -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. -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 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). The filter accepts the following parameters: