It's not an issue. But Y8 support would help to speed up things.
"Y8 is useful for processing RGB as individual planes. Sure one can use YV12 but it can be less efficient for slow filters."
Also we can use it only on luma and other scalers on chroma separately.
Support Y8 (fixed #2)
The new version 0.0.2 supports Y8. Enjoy!
This release may discourage you because processing only Y8 probably improves the performance slightly. Originally the plugin just use the OpenCV's INTER_CUBIC filter for U/V planes, so the process is not slow (this behavior is the same as original waifu2x's).
Ok. Thank you.