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I had to convert quite a few simple PSD files to PNG files (this trick may not work with very complex PSD files).
What worked very well for me:
sips -s format png *
This will convert all images (*) to the png format, pretty quick. Note that each file will be overwritten by its PNG formatted version.
I did use HexFiend to verify the headers and make sure these are now indeed PNG.
To optimize the images (saved app. 40% in filesize for my files), use: ImageOptim (highly recommended to optimize file size for PNG and JPG images).
Note: sips (Scriptable Image Processing System) comes with macOS (seemingly since 2005).
