On Sun, 25 Nov 2018 10:34:13 -0600
Gregory P. Ennis wrote:

> I have an application that I need to acquire, store and merge to a pdf file a
> digital signature from a client. 

Define your workflow in more detail.

If you're still working on adding digitized images of actual physical 
signatures to a pdf
file, then imagemagick can very likely do what you want it to do.  One of its 
capabilities
is finding an image within another image which you can then extract or otherwise
manipulate.
-----------------------------------------------------------------------------------
Frank,

Thanks for your help.  I am ok with the use of pdftk in merging a digital image 
to a pdf
file.  The process that I am having problems solving now is acquiring an image 
'on the
fly'.  There are two work flow categories of signature images that I am needing 
to work
with. I have solved the problem with the first category but not the second.  
The first
category relates to signature images that I can acquire from any copier/scanner 
and then
use gimp to extract the image and then create a jpg file that I can use over 
and over
again.  The second category of image is one that has to be collected at the 
time of a
purchase event.  Using a copier/scanner for this latter process will not really 
work so I
am looking for equipment that will acquire the image and then allow me to 
create a usable
image to merge with the pdf form file with the use of imagemagick or pdftk.

When I researched the topaz pieces of equipment called 'signature pads' they 
appear to have
a proprietary file type.  I contacted their support services, and learned that 
they do have
the ability to convert the image to jpg or other formats, but this requires 
some software
that they will apparently allow the use of with a non-disclosure agreement 
only.  There
appears to be many signature pads that work with Microsoft systems.   I decided 
to post the
question here to see if I could glean how others of resolved this  kind of 
problem with
Centos linux systems.

Hope this fills in the blanks a little.

Greg
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