PDF417 wrong output

[NicosKaralis]

i have this code in my app:

doc = RGhost::Document.new :paper => [7,7] # 3"x2" label

text = 'Test String'
position = {:x => 0.25, :y => 0.25, :width => 6.5, :height => 6.5}

with this code i can create 3 different 2d barcodes...

QR

doc.barcode_qrcode(text, {:eclevel => 'M'}.merge(position) )

Aztec

doc.barcode_azteccode(text, {:text=>{:size=>8}, :format=>"full"}.merge(position) )

and PDF417

doc.barcode_pdf417(text, {:columns=>2, :rows=>10, :text=>{:size=>10}}.merge(position) )

the problem is, i can't read the PDF417 on my scanners... the barcode that was generated can't be read and if somehow i managed to scan it the string given is not the original one

and also the barcode generated is not in the proportions that i want...