https://bugs.kde.org/show_bug.cgi?id=473160
Bug ID: 473160
Summary: bluescreen0r can't be used as a masked effect
Classification: Applications
Product: kdenlive
Version: 23.04.3
Platform: Other
OS: Microsoft Windows
Status: REPORTED
Severity: normal
Priority: NOR
Component: Effects & Transitions
Assignee: [email protected]
Reporter: [email protected]
Target Milestone: ---
SUMMARY
***
I'd like to use bluescreen0r in combination with the Rotoscoping mask effect.
Basically, I want to be able to specify a small area where the bluescreen0r
should alpha out pixels, which can be useful when using material that wasn't
green-screened to remove pixels of a given color, but also only in a given
region.
So the effect chain is quite simple:
1. Rotoscoping (mask)
2. bluescreen0r
3. Mask Apply
However, this doesn't seem to work correctly. In this setup, the bluescreen0r
plugin doesn't do anything at all. I suspect that this is because bluescreen0r
is also classified as a masked effect, even though it's just a filter in
frei0r.
As a workaround, I have been using "Key Spill Mop Up" in place of bluescreen0r
to change the target pixels to `#00ff00` (since Key Spill Mop Up doesn't
support setting an alpha channel, though perhaps that should be a separate
issue). However, this can leave green "bleed" on some areas unless the
tolerance of bluescreen0r is set to be sufficiently high, which may also have
other unwanted side-effects.
STEPS TO REPRODUCE
1. Add Rotorscoping effect
2. Add bluescreen0r effect
3. Add Mask Apply effect
OBSERVED RESULT
Nothing
EXPECTED RESULT
The bluescreen0r effect should be active on pixels in the given rotorscoped
region.
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