09-17-2020, 04:47 PM
Thanks for the reply.
Removing alpha channel for my original (copyrighted) files did not produce large effect.
However, using your other suggestion, I converted pictures to indexed mode before converting them to PNG. That makes a larger difference even for 256 colors and for 128 gives the result that is comparable to manual saving to PNG. I was unable to produce exactly the same result with either your script or indexed mode procedure.
Removing alpha channel for my original (copyrighted) files did not produce large effect.
However, using your other suggestion, I converted pictures to indexed mode before converting them to PNG. That makes a larger difference even for 256 colors and for 128 gives the result that is comparable to manual saving to PNG. I was unable to produce exactly the same result with either your script or indexed mode procedure.