Problem Drawing in CMYK Images

[spyder]

I'm using ImageMagick 6.3.4.

When I try to draw text in a CMYK file only the CMY channels are affected. The K (black) channel is left untouched. I've read some of the post that are related, but there isn't a clear answer in any of them.

The command line I'm using is:

convert -colorspace CMYK -depth 8 -pointsize 100 -fill "cmyk(255, 255, 255, 255)" -draw "text 100,100 'Text to Draw'" CMYK.tif CMYK_Text.tif

I've also tried the cmyka fill command without result in the K or Alpha channel.

Thank you for your response in advance.

[magick]

The rendering engine takes place in the RGBA colorspace. Most other algorithms fully support the CMYKA color model. One solution is to convert your CMYKA to RGBA, draw on it, and then convert it back-- all with color profiles of course to get the best results.

[spyder]

Thank you!