It looks like commit 96628ed13f411298ee0681e7515745fdf85d1309 is the culprit. This change enabled the image processing functions by default, but that seems to have disabled the threshold algorithm in the scanner. I will look for an alternative implementation.
allan On Tue, Oct 4, 2016 at 7:49 PM, m. allan noah <kitno...@gmail.com> wrote: > Mickael, thank you for the report. I thought I had fixed this problem > previously, but I am apparently wrong. I will investigate. > > allan > > On Mon, Oct 3, 2016 at 12:13 PM, PELUARD Mickael > <mickael.pelu...@smart-rx.com> wrote: >> Hello, >> >> >> >> we used Fujitsu scanner (fi-5110 / fi-5120 / fi-6110) for a >> long time with an old linux plateform and sane (1.0.22-9). These scanners >> used the fujitsu backend. >> >> >> >> We have recently changed to RHEL-6 with sane-backends-1.0.21 >> and to Debian with libsane-1.0.25. >> >> >> >> We scan in lineart mode and we only put the threshold option >> to reduce the size of document : scanimage –d ‘fujitsu:XXX:XXX’ --resolution >> 150 --mode lineart --threshold 140 >> >> Then we convert the image to PDF-A1. With the old plateform >> and rhel-6, no problem. But with Debian and sane-1.0.25, the size of the >> documents increase a lot. >> >> >> >> Using a reference document, we get the following results with a fi-6110 : >> >> - Rhel-6 / sane-1.0.21 = around 50 ko >> >> - Debian / sane-1.0.25-2 = around 350 ko >> >> It’s quite the same problem if we used a fi-5110c and fi-5120c. >> >> >> >> I downgrade the libsane package and look the result : >> >> - Debian / libsane-1.0.22-7 = good >> >> - Debian / libsane-1.0.23-3+b1 = good >> >> - Debian / libsane-1.0.24-1 = NOT GOOD >> >> - Debian / libsane-1.0.24-8u5 = NOT GOOD >> >> - Debian / libsane-1.0.26Git = NOT GOOD >> >> >> >> I change the value of threshold on Debian with sane-1.0.25 : threshold 0 or >> 200. But the image don’t change. It’s look like the threshold option has not >> effect. >> >> To reduce the problem, I play with the contrast and brightness option but >> the result is not entirely satisfactory. >> >> >> >> I think the problem is on the threshold option of the fujitsu backends. >> >> >> >> It is probably the same bug but it don’t lokk corrected in 1.0.26 : >> >> https://alioth.debian.org/tracker/?group_id=30186&atid=410366&func=detail&aid=315069 >> >> >> >> Cordially. >> >> >> -- >> sane-devel mailing list: sane-devel@lists.alioth.debian.org >> http://lists.alioth.debian.org/cgi-bin/mailman/listinfo/sane-devel >> Unsubscribe: Send mail with subject "unsubscribe your_password" >> to sane-devel-requ...@lists.alioth.debian.org > > > > -- > "well, I stand up next to a mountain- and I chop it down with the edge > of my hand" -- "well, I stand up next to a mountain- and I chop it down with the edge of my hand" -- sane-devel mailing list: sane-devel@lists.alioth.debian.org http://lists.alioth.debian.org/cgi-bin/mailman/listinfo/sane-devel Unsubscribe: Send mail with subject "unsubscribe your_password" to sane-devel-requ...@lists.alioth.debian.org
