.. _net.sf.openfx.SlitScan: SlitScan node ============= .. raw:: html |pluginIcon|  *This documentation is for version 1.0 of SlitScan (net.sf.openfx.SlitScan).* Description ----------- Apply per-pixel retiming: the time is computed for each pixel from the retime function, which can be either a horizontal ramp, a vertical ramp, or a retime map. The default retime function corresponds to a horizontal slit: it is a vertical ramp, which is a linear function of y, which is 0 at the center of the bottom image line, and 1 at the center of the top image line. Optionally, a vertical slit may be used (0 at the center of the leftmost image column, 1 at the center of the rightmost image column), or the optional single-channel “Retime Map” input may also be used. This plugin requires to render many frames on input, which may require a lot of memory. Note that the results may be on higher quality if the video is slowed fown (e.g. using slowmoVideo) The parameters are: - retime function (default = horizontal slit) - offset for the retime function (default = 0) - gain for the retime function (default = -10) - absolute, a boolean indicating that the time map gives absolute frames rather than relative frames - frame range, only used if the retime function is given by a retime map, because the actual frame range cannot be guessed without inspecting the retime map content (default = -10..0). If “absolute” is checked, this frame range is absolute, else it is relative to the current frame - filter to handle time offsets that “fall between” frames. They can be mapped to the nearest frame, or interpolated between the nearest frames (corresponding to a shutter of 1 frame). References: - An Informal Catalogue of Slit-Scan Video Artworks and Research, Golan Levin, http://www.flong.com/texts/lists/slit_scan/ Inputs ------ +------------+-------------+----------+ | Input | Description | Optional | +============+=============+==========+ | Source |   | No | +------------+-------------+----------+ | Retime Map |   | Yes | +------------+-------------+----------+ Controls -------- .. tabularcolumns:: |>{\raggedright}p{0.2\columnwidth}|>{\raggedright}p{0.06\columnwidth}|>{\raggedright}p{0.07\columnwidth}|p{0.63\columnwidth}| .. cssclass:: longtable +--------------------------------------+---------+-----------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+ | Parameter / script name | Type | Default | Function | +======================================+=========+=================+=========================================================================================================================================================================================================================================================================================================================================================================================================================================================================================+ | Retime Function / ``retimeFunction`` | Choice | Horizontal Slit | | The function that gives, for each pixel in the image, its time. The default retime function corresponds to a horizontal slit: it is a vertical ramp (a linear function of y) which is 0 at the center of the bottom image line, and 1 at the center of the top image line. Optionally, a vertical slit may be used (0 at the center of the leftmost image column, 1 at the center of the rightmost image column), or the optional single-channel “Retime Map” input may also be used. | | | | | | **Horizontal Slit (horizontalslit)**: A vertical ramp (a linear function of y) which is 0 at the center of the bottom image line, and 1 at the center of the top image line. | | | | | | **Vertical Slit (verticalslit)**: A horizontal ramp (alinear function of x) which is 0 at the center of the leftmost image line, and 1 at the center of the rightmost image line. | | | | | | **Retime Map (retimemap)**: The single-channel image from the “Retime Map” input (zero if not connected). | +--------------------------------------+---------+-----------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+ | Retime Offset / ``retimeOffset`` | Double | 0 | Offset to the retime map. | +--------------------------------------+---------+-----------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+ | Retime Gain / ``retimeGain`` | Double | -10 | Gain applied to the retime map (after offset). With the horizontal or vertical slits, to get one line or column per frame you should use respectively (height-1) or (width-1). | +--------------------------------------+---------+-----------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+ | Absolute / ``retimeAbsolute`` | Boolean | Off | If checked, the retime map contains absolute time, if not it is relative to the current frame. | +--------------------------------------+---------+-----------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+ | Max. Frame Range / ``frameRange`` | Integer | min: -10 max: 0 | Maximum input frame range to fetch images from (may be relative or absolute, depending on the “absolute” parameter). Only used if the Retime Map is used and connected. | +--------------------------------------+---------+-----------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+ | Filter / ``filter`` | Choice | Nearest | | How input images are combined to compute the output image. | | | | | | **Nearest (nearest)**: Pick input image with nearest integer time. | | | | | | **Linear (linear)**: Blend the two nearest images with linear interpolation. | +--------------------------------------+---------+-----------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+ .. |pluginIcon| image:: net.sf.openfx.SlitScan.png :width: 10.0%