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)
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