The Compressonator convert dds to png with alpha channel
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what is the command for converting dds to png with alpha channel,

If i use this command

TheCompressonator.exe -convert -r .\dds .\out -format .png

the output pngs don't with alpha channel , if I open TheCompressonator.exe , select Edit-->create alpha channel,and then select file to save original to png, the png file contains alpha channel, but I have a lot of dds files need to be convert