Cannot open xxx.png for reading，but the file has created...

[df257]

[zvezdochiot]

@df257 say:

pngquant -- test.png --ext new.png

pngquant --ext new.png -- test.png

See:

pngquant --help

[kornelski]

-- means everything after that is a file name. So -- --ext reads a file called "--ext".