Please be aware that this is a pre-release. There may be bugs to be fixed, so feel free to open a new issue when you encounter one.

This pre-release implements using directory path as input and preserving alpha channel. However, due to the limitations of the BICUBIC interpolation algorithm, the alpha channel is kinda blurry around the edges.
Upscaling alpha channel with the Real-ESRGAN will be implemented in the future, as well as the traditional resampling algorithms.