[magick-users] -alpha transparent not works

[Vu The Cuong]

Hi,

Curently I'm learning -alpha section of IM at Usage/basic.

It said:

Transparent

Similarly this ensures the alpha channel is 'active' but fully
transparent. 

 

  convert moon.png  -alpha transparent    alpha_transparent.png

 

But when I ran convert moon.png  -alpha transparent
alpha_transparent.png

It throw error: convert: UnrecognizedAlphaChannelType 'transparent' .

I'm I missed something in command of the article is wrong?

I'm in winXP, IM 16bit 6.4.0

 

Thanks and regards,