Sadly, I am just an artist, not a programmer. Even HTML code look crazy to me, and after learning Blueprint for 2 weeks, I still barely familiar with the name and function. Right now I am using software called ImBatch, after trying many method, its the only software that fill my need, it resize texture fast, keep the alpha with same format, and of course batch progress.
Now I can run kite demo with ease, and really learn a lot from it. Thank you very much.