[cups-devel] low level operation with PCL?
Michael Sweet
msweet at apple.com
Mon Mar 23 06:28:30 PDT 2015
Toomas,
> On Mar 21, 2015, at 10:45 AM, Toomas Rosin <toomas at rosin.ee> wrote:
>
> Hello!
>
> I know that PCL is a page description (not low-level) language, and so
> it is perhaps no surprise that I cannot do what I would like to. But
> after an extensive search in the Internet and the PCL documentation, I
> have not yet found a definite negative answer either. Here is my
> problem:
PCL, as implemented in most inkjets, is a pretty low-level as languages go.
> I cannot figure out how to make my printer (HP DeskJet 1280 on USB)
> show me everything I have sent to it so far, *without ejecting the
> page*. I am sending only plain raster graphics and cursor positioning
> commands --- no vector graphics, no text.
That may be difficult to do. Aside from buffering, most inkjet printers employ "shingling" and other interleaving techniques to achieve higher-resolution output and reduce banding. Thus, there is often no way to explicitly and directly control the actions of the print head.
_________________________________________________________
Michael Sweet, Senior Printing System Engineer, PWG Chair
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