Trying to process (resize, rename) by maintaining the original format PNG within several subfolders

I am trying to process (resize, rename ) by maintaining the original format PNG of about 10 000 images. All images are organized in one folder with several subfolders. Therefore the source folder for each image needs to be the destination folder to avoid a manual resorting afterwards. So far I tried the option of the script image process and batch, as well as “save for web” and multiple combinations of them all . So far no luck, because either the original file format cannot be maintained, or the destination folder cannot be equal to the source folder. It seems that some combination of those three main components seem to out rule each other…Help please!