On Sat, Jun 26, 2021 at 04:17:10PM -0400, Federico Grau wrote: > On Sat, Jun 26, 2021 at 08:44:40PM +0100, Brian Potkin wrote: > > On Sat 26 Jun 2021 at 14:27:08 -0400, Federico Grau wrote: > > > > > In brief, success with basic scanning after installing and selecting > > > sane-airscan. > > > > I still have the ADF and 2-sided scanning to explore ...
Hell again debian-printing, I wanted to update some of my progress with the HP ScanJet Pro 3500 f1 Flatbed Scanner and Debian. Trying Debian 10 'buster' (now oldstable) did not function, as there is no "sane-airscan" package in the standard distro. That package is available via backports, but I did not pursue that. As identified earlier, Debian 11 'bullseye' worked very well. Packages I had to install were "sane-airscan" and "hplip". I did not require "hplip-doc" or "hplip-gui"; the latter provides a desktop GUI with scanner status, but also runs additional daemon processes. For a SANE frontend I focused on the "simple-scan" package, which has fewer options/variables than xsane. Simply installing the above two packages and their dependencies (with a reboot to ensure newly installed daemons were running, such as ipp-usb), allowed scans to function to some degree via both the flatbed and ADF. I was surprised things functioned without the proprietary HP binary "plug-in", both from the command line with "hp-scan" (in the hplip package) and with simple-scan. However, without the binary plug-in simple-scan appeared to have a significant memory leak, consuming 4 to 12GB of RAM when scanning ~60 pages from the ADF. Additionally, without the binary plug-in simple-scan could only use the ADF scanning both sides. Trying to scan only the front or back with the ADF resulted in long blank pages. While initially I had added non-priv users to th "lp" group, trying a reinstall without that group membership still functioned OK. Non-priv users could access and use the scanner. To install the binary plug-in, I ran "hp-setup -i" from the hplip Debian package as a non-priv user while the scanner was powered-on and connected. I selected the USB connected scanner, downloaded the plug-in, accepted the license, and provided root credentials when prompted. I also proceeded to setup a "print queue" accepting the defaults, but I'm not clear if that was needed (or if quiting early would interrupt the setup). Using simple-scan, selecting the "eSCL HP ScanJet Pro 3500 f1 (USB)" scanner option was the one that worked (out of the 4 available scanner choices/protocols listed). After the binary plug-in was installed, there were no obvious memory leaks with simple-scan. Trying to scan just the "front" or "back" from the ADF mostly worked, scanning the text side regardless of the selection. This functioned well enough for me to complete the task at hand, and I did not retest with source pages that had text on both sides. Exploring higher quality scans and color calibration, the "argyll" Debian package maintainer (Dmitry Smirnov) was very helpful. He generously assisted with a version upgrade of argyll that supported my calibration target (IT8). Unfortunately, I reached a temporary roadblock, as I do not yet have an output calibration hardware device to measure a monitor. It seems xsane requires both input and output calibration configs. For now that study is paused. On the upside I am pleased to have a functional scanner with an efficient ADF that scans both sides in a single pass. This is a step up from the old HP scanner that performed legacy acrobatics to feed ADF sheets twice for double sided scans, and worse it required a windows computer. Looking ahead I hope to resume exploring calibrated scans, and also OCR. Thanks again everyone for the good work and support. happy hacking, donfede
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