screendump and insert label convert to pdf

[RonaldV]

I want to grab a screenshot and put a label on top, convert to pdf and print, sounds simple ?

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xwd -root | convert xwd:- label:"this is a label" +swap -append pdf:- | lpr -o fit-to-page

and i have a blank page. When I do not use +swap, I get a nice printout, only the label at the bottom.
So I tried

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xwd -root | convert -xwd:- label:"this is a label" +swap -append image.png

The image.png looks good, but after

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convert image.png image.pdf

the image.pdf is not as expected. Without the +swap ithe image.pdf look ok.
What am I doing wrong ?
I am using Imagemagic version 6.9.8-7 and Ghostscript 9.20 (2016-09-26) with Mageia 6