Difference between revisions of "UM:Dvo Effects Dvo Flicker"
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<td style="width:36px; border: none" valign="top" width="36"><p class="p_DVTableText">[[File:dv_note.png|alt=dv_note]]</p> | <td style="width:36px; border: none" valign="top" width="36"><p class="p_DVTableText">[[File:dv_note.png|alt=dv_note]]</p> | ||
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− | <td style="width:760px; border: none" valign="middle" width="760"><p class="p_DVTableText"><span class="f_DVTableText">Chrominance | + | <td style="width:760px; border: none" valign="middle" width="760"><p class="p_DVTableText"><span class="f_DVTableText">Chrominance fluctuations are often termed </span><span class="f_DVTableText" style="font-style: italic;">chroma breathing</span><span class="f_DVTableText">.</span></p> |
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Revision as of 16:59, 26 May 2017
DVO Flicker analyses the image sequence to remove brightness and chrominance fluctuations. These may be caused by varying exposure time, unsynchronised light sources, telecine tranfer, aging film stock and/or film chemical related issues.
The effect is enabled and the colour mode of the input set via the basic setup options :
Setup
The main configuration options are described below.
Mode
This parameter describes the general nature of the flickering. There is one setting curernt, Location Invariant. This is a flicker that occurs globally on a frame and is not isolated to portions within a frame.
Temporal Window
Values : |
5, 7, 9 , 11 |
Default : |
11 |
The Temporal Window specifies how many frames to use for the analysis.
Variation Control
Numeric slider, value range 0-1.
Range : |
0 to 1 |
Default : |
0.5 |
The Variation Control parameter sets how precise and controlled we are when we make adjustments for flicker. The higher the value we use, the more care is taken. Lower values allow for larger adjustments (less control).
Lower values (allowing larger adjustments) are best for simple scenes. Larger settings may be required to take better account of more complex and dynamic scenes with more real-world intensity changes (e.g. high-speed pans etc.). |
Enhanced Adjust
Values : |
Off, Low, Medium, High |
Default : |
Medium |
This will apply further processing enhancements to deal with small scale variations (both local and global).
Max Adjust Limitation
Range : |
0 to 10 |
Default : |
4 |
This sets an adjustment limit to the general processing mode. The setting corresponds to a percentage (%) of the full signal.
Black Level Save
Black Level Save lets us enable specific processing to preserve black levels in the sequence.
If enabled, the Low and High parameters are used to assign the level of processing performed at the lower (blackest) end of the input sequence. Both Low and High are 10 bit numbers and limited to values between 0 and 100 (out of the full 10 bit range, 1024).
Low
Range : |
0 to 100 |
Default : |
0 |
If the input level is less than or equal to the setting for Low, no flicker adjustment is performed and the input signal is untouched.
High
Range : |
0 to 100 |
Default : |
1 |
If the input level is greater than or equal to the setting for High, full flicker adjustment is performed.
Chroma
The Chroma button enables the removal of chrominance flicker (i.e."colour breathing").
The Chroma toggle removes luminance flicker as well (if present). However, for best performance, leave Chroma off unless you have chrominance flickering to remove. |