"PNG driver doesn't support data type Int16. Only eight bit (Byte) and sixteen bit (UInt16) bands supported. Defaulting to Byte" [t]2020-10-05 22:05:49
関連するかも情報
GeoTiff から CreateCopy で PNG にするしかなさそう。
"You can use Create() to create an intermediate file in GeoTiff format, and then use the CreateCopy() method to create JPEG or PNG."
"PNG driver doesn't support data type Int16. Only eight bit (Byte) and sixteen bit (UInt16) bands supported. Defaulting to Byte" [t]2020-10-05 22:05:49