Using pdf beads in Content transformation

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Has anyone tried to implement pdfbeads in Alfresco via content transformation.
PdfBeads is a Ruby gems application similar to hocr2pdf but more precise, it creates a pdf document,
from hocr output (OCRed html output from tesseract) and the tiff image of the document.
I know that I have implemented the transformer correctly, since the script in transformer is runned
and all components other than pdfbeads are executed.
Pdfbeads works great when strated on computer via console( OS is Debian)
I think that I would have to define the proccess variables for pdfbeads.
So has anyone implemented Pdfbeads succesfully?
Any other ideas perhaps?

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I have solved this problem.
You have to add process variables in the transformer,
but not process variables for Ruby or Ruby gems,
but only for imageMagick(the same way they are defined in default transformer for ImageMagick).