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Note some backends.

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@ -175,22 +175,36 @@ catch(std::exception& e) {
opened directly from device such as camera or removable data storage)"
## Developer Notes
* The RotoCanvas class is modular, with hopes that it can be used by
various video editing applications in the future. The recommended use
of RotoCanvas in a video editing application is for applying effects
(primarily manual rotoscoping) to source videos (as frame sequences)
as a preprocessing step before they are trimmed or other effects are
added, since rotoscoping is highly dependent on the source frame (base
layer) remaining the same. Using the RotoCanvas as a post-processing
effect is possible, but accurate frame seeking must be assured somehow
(such as by a frame-accurate video editing engine), and further edits
to the previous layers will in some cases cause the rotoscoped parts
(parts of the image edited by RotoCanvas) to no longer make sense
(such as, if a lens pinch effect is added to a scene where there was a
layer order error that has been rotoscoped out, instead of the error
being rotoscoped out, there will be both the error and a corrected
blotch that is the error's original position & shape), which in such
cases would require redoing the rotoscoping.
The RotoCanvas class is modular, with hopes that it can be used by
various video editing applications in the future. The recommended use
of RotoCanvas in a video editing application is for applying effects
(primarily manual rotoscoping) to source videos (as frame sequences) as
a preprocessing step before they are trimmed or other effects are
added, since rotoscoping is highly dependent on the source frame (base
layer) remaining the same. Using the RotoCanvas as a post-processing
effect is possible, but accurate frame seeking must be assured somehow
(such as by a frame-accurate video editing engine), and further edits
to the previous layers will in some cases cause the rotoscoped parts
(parts of the image edited by RotoCanvas) to no longer make sense (such
as, if a lens pinch effect is added to a scene where there was a layer
order error that has been rotoscoped out, instead of the error being
rotoscoped out, there will be both the error and a corrected blotch
that is the error's original position & shape), which in such cases
would require redoing the rotoscoping.
### Backends
#### Python
(Not Tried Yet)
- [moviepy](https://github.com/Zulko/moviepy)
- [Examples](https://zulko.github.io/moviepy/examples/examples.html)
- https://github.com/colour-science/colour
- <https://github.com/gtaylor/python-colormath>: "A python module that
abstracts common color math operations. For example, converting from
CIE L*a*b to XYZ, or from RGB to CMYK
http://python-colormath.readthedocs.org"
- <https://github.com/mattrobenolt/colors.py>: "Convert colors between
rgb, hsv, and hex, perform arithmetic, blend modes, and generate
random colors within boundaries"
### RotoCanvas Paint Notes
* The save method is used by both the Save and the Save As actions. The