PNG to PCL two different versions?

[mduleone]

Hello everyone!
I'm trying to take a QR code that I'm using http://fukuchi.org/works/qrencode/index.html.en to create. The encoder creates a black and white PNG, with no alpha layers.

I'm running IM on two different Linux machines, and on one of the boxes (IM version 6.2.8.0),

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convert image.png image.pcl

converts the images correctly and works great. On the other Linux machine (IM version 6.5.4.7) however,

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convert image.png image.pcl

converts the image to a black square.

I've tried adding the following options, to no avail.

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convert image.png -monochrome image.pcl

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convert image.png -background #FFFFFF image.pcl

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convert image.png -background #FFFFFF00 image.pcl

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convert image.png -opaque #FFFFFF image.pcl

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convert image.png -opaque #FFFFFF00 image.pcl

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convert image.png -fill #FFFFFF image.pcl

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convert image.png -fill #FFFFFF00 image.pcl

They either white out the image or do nothing. Does anyone have any suggestions as to resolving this? I'd prefer to not have to downgrade the version on the Linux machine that's not working, if possible.