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"plug-in-gap-onionskin-configuration"
Onionskin Layers:
Onionskin Layer(s) usually do show previous (or next) frame(s)
of the video in the current frame.
The GIMP Video Menu has a submenu named "Onionskin" that provides
functions to deal with onionskin layers
Start from Menu:
<Image>/Video/Onionskin/Configuration...
<Image>/Video/Onionskin/Create or Replace
<Image>/Video/Onionskin/Delete
<Image>/Video/Onionskin/Toggle Visibility
Onionskin layers are copies of previous or next frames
of the video.
By default they are built by merging the visible
layers of the previous frame but without the BG-Layer
(and without other onionlayers).
Onionskin layers are usually placed above the backroundlayer
in the layerstack of the current frame.
Onion Layers are normally used for display of the previous
scene when painting moving characters.
They behave like a normal layer, but you can toggle
visibility or delete onionskin layers
with Functions provided by this module.
Configuration:
In the onionskin configuration dialog window you can
- edit the settings for creation of onionskin layers
- apply the settings to a selected range of frames
- delete onionskin layers in a selected range of frames.
Reference Mode:
NORMAL /* default */
The Frame Reference Parameter is used as delta
in just one direction.
Negative values refere to previous frames only,
positive values refere to next frames only.
BIDRIECTIONAL_SINGLE
The Frame Reference Parameter is used as
bidirectional delta in both directions
With an inital Frame Reference offset -1
the reference sequence is
-1, +2, -3, +4, -5, +6, ...
BIDRIECTIONAL_DOUBLE
The Frame Reference Parameter is used as
bidirectional delta in both directions
With an inital Frame Reference offset -1
the reference sequence is
-1, +1 -2, +2, -3, +3, ...
Onionskin Layers:
Defines how many onionlayers will be created in
the current image.
Frame Reference:
Stepsize to reference the source framenumber
from where we copy the onionlayer.
Examples:
-1 .. copy 1.st onionlayer from current framenumber -1
copy 2.nd onionlayer from current framenumber -2
+2 .. copy 1.st onionlayer from current framenumber +2
copy 2.nd onionlayer from current framenumber +4
The example assumes Reference Mode NORMAL.
Cyclic (Togglebutton):
Define fold back behavior when referencing previous
or next frames:
ON: last frame has frame 0 as next frame.
OFF: last frame has NO next frame.
Stackposition:
Position where to place onionlayer(s) in the layerstack.
From TOP (Togglebutton):
ON: Stackposition is counted from top (0 is on top)
OFF: Stackposition is counted from bottom (0 is on bottom)
Opacity:
The 1.st onionlayer is created with this
opacity seting (100 is full opaque, 0 is full transparent)
Opacity Delta:
100 : The 2.nd onionlayer is created with same
opacity as the 1.st onionlayer.
80 : The 2.nd onionlayer is created with
80% of the opacity of the 1.st onionlayer,
The 3.rd with 80% of the 2.nd and so on...
Ascending Opacity (Togglebutton):
ON: the farest handled Neighbour Frame has the
highest Opacity (the Primary Opcaty defined above)
This may be used to create cross-fading effects.
(*) see cross-fading example settings below.
OFF: the nearest handled Neighbour Frame has the
highest Opacity, Opacity is descending
for the other frames at farer distance.
This should be used for regular Onionskin usage.
Options how to merge the previous Layer into one Onionlayer:
Restrict by Layernames: Default '*' all Names.
Here you can specify a layernamepattern.
only layers with matching names are included
in the onionlayer.
Ignore BottomLayer(s): Default 1
Here you can exclude the background layer (1)
or n layers counted from the bottom of the
layerstack from the merged copy of the frame
that makes up the onionlayer.
Auto Create after Load
ON: Force automatic Creation (or Replacement) of Onionskin Layer(s)
on GAP controlled Framechanges.
Auto Delete before Save
ON: Force automatic Delete of Onionskin Layer(s)
on GAP controlled Framechanges.
GAP controlled Framechanges are GoTo Operations in the Video Menu
or in The Video/VCR Navigator Dialog or in the Video/Playback
dialogs.
The Buttons:
APPLY:
The apply button creates onion layers in the selected range
of frames and sets the values for the handled Animation.
DELETE:
The delete button removes onion layers in the selected range
of frames and sets the values for the handled Animaton.
CLOSE:
This button Closes the window and sets the values for the current
handled Animation, without changing any frame.
DEFAULT:
Load hardcoded defaults (does not set anything)
SET for <name_of_the_current_animation>:
This button sets the values for the current
handled Animation.
Restrictions:
- The Onionskin automatic does NOT work if you load a frame
via the File Menu, or othe implicite file load/save operations.
- Onionskin Layers are restricted to Imagefortmats that can store
multiple layers, layer parasites and tattoos.
GIMP's native format XCF is rcommanded.
Onionskin Functions:
The other functions in the Video/OnionskinLayer menu
do not open dialog windows.
They are intended for quick use, and it is recommanded
to assign key-shortcuts if you want to use them
frequently.
### here we should refere to gimp docs howto assign key-shortcuts ###
Create or Update Onion Layers:
Create onionlayers in the current frame,
according to the configurated settings.
(see above)
Toggle Visibility:
Turn visibilty on (or off) for all onionlayers.
Delete Onion Layers:
Remove all onionlayers from the current frame.
Note: if you made a copy of an onionlayer manually
the copy should not be deleted.
If you have gimp-1.2.2 the copy will be deleted too,
because there is a bug in the gimp video base functions.
Tips: Cross-Fading Example
With special Onionskin Settings you can get Cross Fading Effects.
An animation was created with a Framerate of 8 f/sec
and should playback on a target rate of 24 f/sec
As 1.st step you need to duplicate all the frames in a way like this:
01 02 03 04 ... original squence
01 02 03 04 05 06 07 08 09 10 11 12 .... new numbers
01 01 01 02 02 02 03 03 03 04 04 04 .... (old original numbers)
Use the Menu <Image>/Video/Frames Density... for this task.
To to improve smoothness, you can use Onionskin Layers
to show 1 and 2 frames ahead on top of the Layerstack.
In The 2.nd Step You create Onionskin Layers in all resulting Frames
with the following Settings:
Onionskin Layers: 2 Ascending Opacity: ON
Frame Reference: 1 Cyclic: OFF
Stackposition: 0 From Top: ON
Opacity: 66.6 50.0
Ignore BG-layer(s): 0 // do not ignore any Layer
From Frame: 1
To Frame : the last frame of your animation
When you wan equally balanced Opacity
you should use Opacity 1/3 for each frame
33.3 %, 100%
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