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[elfantin <mikspace-ubuntu@xxxxxxxxxxx>]

Didn't work for me with HP Officejet Pro 8610; I'm on Mint 17.1 Rebecca (based on 14.04).
I had hplip 3.15.4. I upgraded (hp-upgrade) to 3.15.6. No improvement on the jpeg front. So uninstalled it (hp-uninstall), installed hplip from standard repos. Still no improvement.
So I activated trusty-proposed and installed:
sudo apt-get install hplip/trusty-proposed
sudo apt-get install printer-driver-postscript-hp/trusty-proposed
sudo apt-get install hplip-gui/trusty-proposed

Now xsane wouldn't see the scanner at all.

I tried some hp- commands (hp-setup ,   hp-doctor ,  hp-scan ,  hp-
uninstall) but they give errors (such as ImportError: /usr/lib/python2.7
/dist-packages/hpmudext.so: undefined symbol: hpmud_make_par_uri).

I've now removed the packages from -proposed and put back 3.15.6 (with
ongoing jpeg problem).

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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:
  Confirmed
Status in hplip package in Ubuntu:
  Fix Released
Status in hplip source package in Trusty:
  Fix Committed
Status in hplip source package in Utopic:
  Fix Committed

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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