Obviously, RAW scanning is completely disabled on purpose. In ledm.c I
found the following in function set_scan_mode_side_effects:
switch (scanMode)
{
case CE_K1: /* same as GRAY8 */
case CE_GRAY8:
case CE_COLOR8:
default:
// ps->compressionList[j] = STR_COMPRESSION_NONE;
// ps->compressionMap[j++] = SF_RAW;
ps->compressionList[j] = STR_COMPRESSION_JPEG;
ps->compressionMap[j++] = SF_JPEG;
ps->currentCompression = SF_JPEG;
ps->option[LEDM_OPTION_JPEG_QUALITY].cap |= SANE_CAP_SOFT_SELECT; /*
enable jpeg quality */
break;
}
Obviously, anything other than JPEG is disallowed. Enabling these two
lines lets me select compression "none" without problems, but I still
get the JPEG artifacts.
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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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https://bugs.launchpad.net/ubuntu/+source/hplip/+bug/1245578/+subscriptions
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