IM 6.6.5 in Win32 XP SP3-convert from png to jp2, alpha lost

[shelim]

I am trying to convert png image via

Code: Select all

>convert.exe "example.png" -define jp2:rate=0.1 "example.jp2"

conversion from this



resulted in image trimed of alpha channel (in place of 0% alpha there were random garbages)


when I changed my command line to

Code: Select all

>convert.exe "example.png" -alpha On -define jp2:rate=0.1 "example.jp2"

there were still no changes, but when I changed to

Code: Select all

>convert.exe "example.png" -alpha Extract -define jp2:rate=0.1 "example.jp2"

the alpha was extracted properly (resulting in grayscale image)

Image Magick 6.6.5 Q16, prebuilt portable version, under Windows XP Service Pack 3 (x86)

Please excuse my poor english