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$ gscan2pdf --info
INFO - Starting gscan2pdf 2.5.2
INFO - Log level INFO
INFO - Using fr_FR.UTF-8 locale
INFO - Startup LC_NUMERIC C
INFO - Reading config from /home/legratietstephane/.config/gscan2pdfrc
INFO - Config file version 2.5.2
INFO - Operating system: linux
INFO - LSB_VERSION=
DISTRIB_ID="Mageia"
DISTRIB_RELEASE=7
DISTRIB_CODENAME=mga7
DISTRIB_DESCRIPTION="Mageia 7"
INFO - Mageia release 7 (Official) for x86_64
INFO - Mageia release 7 (Official) for x86_64
INFO - Mageia release 7 (Official) for x86_64
INFO - Mageia release 7 (Official) for x86_64
INFO - NAME="Mageia"
VERSION="7"
ID=mageia
VERSION_ID=7
ID_LIKE="mandriva fedora"
PRETTY_NAME="Mageia 7"
ANSI_COLOR="1;36"
HOME_URL="http://www.mageia.org/"
SUPPORT_URL="http://www.mageia.org/support/"
BUG_REPORT_URL="https://bugs.mageia.org/"
PRIVACY_POLICY_URL="https://wiki.mageia.org/en/Privacy_policy"
INFO - Mageia release 7 (Official) for x86_64
INFO - Mageia release 7 (Official) for x86_64
INFO - Perl version v5.28.3
INFO - Glib-Perl version 1.329
INFO - Glib::Object::Introspection version 0.047
INFO - Built for Glib 2.58.3
INFO - Running with Glib 2.60.2
INFO - Gtk3-Perl version 0.034
INFO - Built for GTK 3.24.8
INFO - Running with GTK 3.24.8
INFO - Gscan2pdf::Document version 2.5.2
INFO - Using PDF::API2 version 2.033
INFO - Using Sane version 1.0.28
INFO - Using libimage-sane-perl version 0.14
INFO - which tesseract
INFO - Spawned PID 6877
INFO - which ocroscript
INFO - Spawned PID 6878
INFO - which cuneiform
INFO - Spawned PID 6879
INFO - unpaper --version
INFO - Spawned PID 6880
INFO - Found Image::Magick 7.0.10
INFO - Found unpaper 6.1
INFO - convert --version
INFO - Spawned PID 6881
INFO - Found imagemagick 7.0.10-55
INFO - scanadf --version
INFO - Spawned PID 6882
INFO - Found scanadf 1.0.14
INFO - xdg-email --version
INFO - Spawned PID 6885
INFO - Found xdg 1.1.3
INFO - gocr -h
INFO - Spawned PID 6887
INFO - Found gocr 0.52 20181015
INFO - cjb2 --version
INFO - Spawned PID 6888
INFO - Found djvu 3.5.27
INFO - tiffcp -h
INFO - Spawned PID 6889
INFO - Unable to parse version string from: ''
INFO - pdftops -v
INFO - Spawned PID 6890
INFO - Found pdftops 0.74.0
INFO - pdfunite -v
INFO - Spawned PID 6891
INFO - Found pdfunite 0.74.0
INFO - gs --version
INFO - Spawned PID 6892
INFO - Found pdf2ps 9.27
INFO - pdftk --version
INFO - pdftk --version: command not found
INFO - Attention : Il manque des packages
La sauvegarde d'une image n�cessite libtiff
WARN - $VAR1 = undef;

INFO - Checking /tmp for crashed sessions
WARN - $VAR1 = undef;

INFO - Using /tmp/gscan2pdf-Am1y for temporary files
INFO - Sane->get_devices returned: $VAR1 = [
{
'model' => 'DR-2010C',
'name' => 'canon_dr:libusb:002:002',
'type' => 'scanner',
'vendor' => 'CANON'
}
];

INFO - signal 'changed-device-list' emitted with data: $VAR1 = [
{
'label' => 'CANON DR-2010C',
'model' => 'DR-2010C',
'name' => 'canon_dr:libusb:002:002',
'type' => 'scanner',
'vendor' => 'CANON'
}
];

INFO - signal 'changed-device' emitted with data: 'canon_dr:libusb:002:002'

(gscan2pdf:6872): Gtk-CRITICAL **: 09:48:17.455: gtk_combo_box_text_insert: assertion 'GTK_IS_LIST_STORE (store)' failed

(gscan2pdf:6872): Gtk-CRITICAL **: 09:48:17.455: gtk_combo_box_text_insert: assertion 'GTK_IS_LIST_STORE (store)' failed

(gscan2pdf:6872): Gtk-CRITICAL **: 09:48:17.455: gtk_combo_box_text_insert: assertion 'GTK_IS_LIST_STORE (store)' failed
INFO - sane_set_option 6 (page-width) to 60 returned status 0 (Success) with info 7 (SANE_INFO_RELOAD_PARAMS + SANE_INFO_RELOAD_OPTIONS + SANE_INFO_INEXACT)
INFO - sane_set_option 7 (page-height) to 120 returned status 0 (Success) with info 7 (SANE_INFO_RELOAD_PARAMS + SANE_INFO_RELOAD_OPTIONS + SANE_INFO_INEXACT)
INFO - sane_set_option 4 (resolution) to 100 returned status 0 (Success) with info 6 (SANE_INFO_RELOAD_PARAMS + SANE_INFO_RELOAD_OPTIONS)
INFO - rotate facing 0
INFO - rotate reverse 0
INFO - unpaper
INFO - UDT
INFO - Current UDT gimp %i
INFO - OCR 1
INFO - threshold-before-ocr
INFO - Scanning 0 pages from 1 with step 1
INFO - gscan2pdf: scanning image of size 236x472 pixels at 8 bits/pixel
INFO - gscan2pdf: acquiring gray frame
INFO - gscan2pdf: sane_read: End of file reached
INFO - gscan2pdf: min/max graylevel value = 255/0
INFO - gscan2pdf: read 111392 bytes in total
INFO - Scanned page /tmp/gscan2pdf-Am1y/8PrySGnPY6.pnm. (scanner status = 5)
WARN - $VAR1 = undef;

INFO - Importing scan with resolution=100,100
INFO - Header suggests 111427
INFO - Expecting 111427, found 111427
INFO - New page filename /tmp/gscan2pdf-Am1y/8PrySGnPY6.pnm, format Portable anymap
INFO - New page written as /tmp/gscan2pdf-Am1y/iJLmSKJwaa.pnm (793C9E9C-817D-11EB-8F8D-F3B669855CCB)
INFO - Added /tmp/gscan2pdf-Am1y/iJLmSKJwaa.pnm (793C9E9C-817D-11EB-8F8D-F3B669855CCB) at page 1 with resolution 100,100
WARN - $VAR1 = [
bless( do{\(my $o = 83736048)}, 'Gtk3::TreePath' )
];

WARN - $VAR1 = [
bless( do{\(my $o = 138844960)}, 'Gtk3::TreePath' )
];

INFO - Scanning 0 pages from 1 with step 1
INFO - New page filename /tmp/gscan2pdf-Am1y/TVeL2Vbwzk.png, format Portable Network Graphics
INFO - New page written as /tmp/gscan2pdf-Am1y/YvLcULZtRw.png (79556EB8-817D-11EB-8F8D-F3B669855CCB)
INFO - Converted /tmp/gscan2pdf-Am1y/iJLmSKJwaa.pnm to /tmp/gscan2pdf-Am1y/YvLcULZtRw.png
INFO - Replaced /tmp/gscan2pdf-Am1y/iJLmSKJwaa.pnm (793C9E9C-817D-11EB-8F8D-F3B669855CCB) at page 1 with /tmp/gscan2pdf-Am1y/fCHJkpK0Pu.png (793C9E9C-817D-11EB-8F8D-F3B669855CCB), resolution 100,100
WARN - $VAR1 = [
bless( do{\(my $o = 147284400)}, 'Gtk3::TreePath' )
];

WARN - $VAR1 = [
bless( do{\(my $o = 68005552)}, 'Gtk3::TreePath' )
];

INFO - writing temporary image /tmp/ChcXxSDDEa.pnm
INFO - gocr /tmp/ChcXxSDDEa.pnm -o /tmp/zf05Y4G_fs.txt
INFO - Spawned PID 6992
INFO - Replaced /tmp/gscan2pdf-Am1y/fCHJkpK0Pu.png (793C9E9C-817D-11EB-8F8D-F3B669855CCB) at page 1 with /tmp/gscan2pdf-Am1y/WGV6PByxgN.png (793C9E9C-817D-11EB-8F8D-F3B669855CCB), resolution 100,100
WARN - $VAR1 = [
bless( do{\(my $o = 138845024)}, 'Gtk3::TreePath' )
];

WARN - $VAR1 = [
bless( do{\(my $o = 147810944)}, 'Gtk3::TreePath' )
];

WARN - $VAR1 = [
bless( do{\(my $o = 151282320)}, 'Gtk3::TreePath' )
];

INFO - gscan2pdf: sane_start: Document feeder out of documents

tiffcp -h
LIBTIFF, Version 4.2.0
Copyright (c) 1988-1996 Sam Leffler
Copyright (c) 1991-1996 Silicon Graphics, Inc.

usage: tiffcp [options] input... output
where options are:
-a append to output instead of overwriting
-o offset set initial directory offset
-p contig pack samples contiguously (e.g. RGBRGB...)
-p separate store samples separately (e.g. RRR...GGG...BBB...)
-s write output in strips
-t write output in tiles
-x force the merged tiff pages in sequence
-8 write BigTIFF instead of default ClassicTIFF
-B write big-endian instead of native byte order
-L write little-endian instead of native byte order
-M disable use of memory-mapped files
-C disable strip chopping
-i ignore read errors
-b file[,#] bias (dark) monochrome image to be subtracted from all others
-,=% use % rather than , to separate image #'s (per Note below)
-m size set maximum memory allocation size (MiB). 0 to disable limit.

-r # make each strip have no more than # rows
-w # set output tile width (pixels)
-l # set output tile length (pixels)

-f lsb2msb force lsb-to-msb FillOrder for output
-f msb2lsb force msb-to-lsb FillOrder for output

-c lzw[:opts] compress output with Lempel-Ziv & Welch encoding
-c zip[:opts] compress output with deflate encoding
-c lzma[:opts] compress output with LZMA2 encoding
-c zstd[:opts] compress output with ZSTD encoding
-c webp[:opts] compress output with WEBP encoding
-c jpeg[:opts] compress output with JPEG encoding
-c jbig compress output with ISO JBIG encoding
-c packbits compress output with packbits encoding
-c g3[:opts] compress output with CCITT Group 3 encoding
-c g4 compress output with CCITT Group 4 encoding
-c sgilog compress output with SGILOG encoding
-c none use no compression algorithm on output

Group 3 options:
1d use default CCITT Group 3 1D-encoding
2d use optional CCITT Group 3 2D-encoding
fill byte-align EOL codes
For example, -c g3:2d:fill to get G3-2D-encoded data with byte-aligned EOLs

JPEG options:
# set compression quality level (0-100, default 75)
r output color image as RGB rather than YCbCr
For example, -c jpeg:r:50 to get JPEG-encoded RGB data with 50% comp. quality

LZW, Deflate (ZIP), LZMA2, ZSTD and WEBP options:
# set predictor value
p# set compression level (preset)
For example, -c lzw:2 to get LZW-encoded data with horizontal differencing,
-c zip:3:p9 for Deflate encoding with maximum compression level and floating
point predictor.

Note that input filenames may be of the form filename,x,y,z
where x, y, and z specify image numbers in the filename to copy.
example: tiffcp -c none -b esp.tif,1 esp.tif,0 test.tif
subtract 2nd image in esp.tif from 1st yielding uncompressed result test.tif