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[Maarten Deprez <deprez.maarten@xxxxxxxxx>]

Hi, i succeeded to enable raw scanning on my HP Deskjet 4615 with this
patch. The solution seems to be pretty generic, but there might be good
(as opposed to "good") reasons it is disabled by default. Maybe it gives
unexpected results with some hardware. Also, it gets a bit "quick and
dirty" in the function that calculates line sizes (i had to disable the
"given" values in favour of the "guessed" (and more correct) ones), but
at least it works fine for me.

** Patch added: "hplip-raw-scanning.patch"
   https://bugs.launchpad.net/ubuntu/+source/hplip/+bug/1245578/+attachment/4218379/+files/hplip-raw-scanning.patch

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https://bugs.launchpad.net/bugs/1245578

Title:
  cannot disable JPEG compression when scanning (Deskjet 3520 All-in-
  one)

Status in “hplip” package in Ubuntu:
  New

Bug description:
  I've already filed a "question"
  (https://answers.launchpad.net/hplip/+question/238002), but I came to
  the conclusion it's indeed a bug.

  I have a Deskjet 3520 All-in-one and no matter what I do, scans always
  arrive with JPEG artifacts. For example, with hp-scan, when I disable
  compression, I get the following error message:

  "error: Unable to set option compression to value None"

  When running XSane, in the advanced settings menu, I get JPEG as only
  compression option. Manually setting the compression to "none" in the
  drc file has no positive effect either. In any case, scans arrive with
  severe JPEG artifacts.

  Used hplip version is 3.13.10 on Kubuntu 13.10. I've attached the
  output of hp-check.

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