I scanned the same document with Simple Scan and had no trouble
producing a grayscale image. I'm no expert, but that seems to rule out
HPLIP as being the problem.
I just did the same scan with XSane to be sure it was gray (SimpleScan
doesn't specify between gray and B&W) and produced a perfect scan.
Here's the gscan2pdf output:
undef,
{
'cap' => 0,
'unit' => 0,
'max_values' => 0,
'desc' => '',
'title' => 'Scan Mode',
'type' => 5,
'constraint_type' => 0
},
{
'cap' => 5,
'max_values' => 1,
'name' => 'mode',
'val' => 'Gray',
'unit' => 0,
'desc' => 'Selects the scan mode (e.g., lineart, monochrome, or
color).',
'constraint' => [
'Color',
'Gray',
'Lineart'
],
'type' => 3,
'title' => 'Scan mode',
'constraint_type' => 3
},
{
'cap' => 37,
'max_values' => 1,
'name' => 'source',
'val' => undef,
'unit' => 0,
'desc' => 'Selects the scan source (such as a document-feeder).',
'constraint' => [
'Flatbed',
'Transparency Adapter'
],
'type' => 3,
'title' => 'Scan source',
'constraint_type' => 3
},
{
'cap' => 5,
'max_values' => 1,
'name' => 'preview',
'val' => 0,
'unit' => 0,
'desc' => 'Request a preview-quality scan.',
'type' => 0,
'title' => 'Preview',
'constraint_type' => 0
},
{
'cap' => 5,
'max_values' => 1,
'name' => 'depth',
'val' => 8,
'unit' => 0,
'desc' => 'Number of bits per sample, typical values are 1 for
"line-art" and 8 for multibit scans.',
'constraint' => [
8,
16
],
'type' => 1,
'title' => 'Bit depth',
'constraint_type' => 2
},
{
'cap' => 5,
'max_values' => 1,
'name' => 'resolution',
'val' => 300,
'unit' => 4,
'desc' => 'Sets the resolution of the scanned image.',
'constraint' => [
1200,
600,
300,
150,
75
],
'type' => 1,
'title' => 'Scan resolution',
'constraint_type' => 2
},
{
'cap' => 64,
'unit' => 0,
'max_values' => 0,
'desc' => '',
'title' => 'Geometry',
'type' => 5,
'constraint_type' => 0
},
{
'cap' => 5,
'max_values' => 1,
'name' => 'tl-x',
'val' => 0,
'unit' => 3,
'desc' => 'Top-left x position of scan area.',
'constraint' => {
'min' => 0,
'max' => '215.899993896484',
'quant' => 0
},
'type' => 2,
'title' => 'Top-left x',
'constraint_type' => 1
},
{
'cap' => 5,
'max_values' => 1,
'name' => 'tl-y',
'val' => 0,
'unit' => 3,
'desc' => 'Top-left y position of scan area.',
'constraint' => {
'min' => 0,
'max' => 295,
'quant' => 0
},
'type' => 2,
'title' => 'Top-left y',
'constraint_type' => 1
},
{
'cap' => 5,
'max_values' => 1,
'name' => 'br-x',
'val' => '215.899993896484',
'unit' => 3,
'desc' => 'Bottom-right x position of scan area.',
'constraint' => {
'min' => 0,
'max' => '215.899993896484',
'quant' => 0
},
'type' => 2,
'title' => 'Bottom-right x',
'constraint_type' => 1
},
{
'cap' => 5,
'max_values' => 1,
'name' => 'br-y',
'val' => 279,
'unit' => 3,
'desc' => 'Bottom-right y position of scan area.',
'constraint' => {
'min' => 0,
'max' => 295,
'quant' => 0
},
'type' => 2,
'title' => 'Bottom-right y',
'constraint_type' => 1
},
{
'cap' => 64,
'unit' => 0,
'max_values' => 0,
'desc' => '',
'title' => 'Enhancement',
'type' => 5,
'constraint_type' => 0
},
{
'cap' => 69,
'max_values' => 1,
'name' => 'custom-gamma',
'val' => 0,
'unit' => 0,
'desc' => 'Determines whether a builtin or a custom gamma-table
should be used.',
'type' => 0,
'title' => 'Use custom gamma table',
'constraint_type' => 0
},
{
'cap' => 101,
'max_values' => 16384,
'name' => 'gamma-table',
'val' => undef,
'unit' => 0,
'desc' => 'Gamma-correction table. In color mode this option
equally affects the red, green, and blue channels simultaneously (i.e., it is
an intensity gamma table).',
'constraint' => {
'min' => 0,
'max' => 16383,
'quant' => 0
},
'type' => 1,
'title' => 'Image intensity',
'constraint_type' => 1
},
{
'cap' => 101,
'max_values' => 16384,
'name' => 'red-gamma-table',
'val' => undef,
'unit' => 0,
'desc' => 'Gamma-correction table for the red band.',
'constraint' => {
'min' => 0,
'max' => 16383,
'quant' => 0
},
'type' => 1,
'title' => 'Red intensity',
'constraint_type' => 1
},
{
'cap' => 101,
'max_values' => 16384,
'name' => 'green-gamma-table',
'val' => undef,
'unit' => 0,
'desc' => 'Gamma-correction table for the green band.',
'constraint' => {
'min' => 0,
'max' => 16383,
'quant' => 0
},
'type' => 1,
'title' => 'Green intensity',
'constraint_type' => 1
},
{
'cap' => 101,
'max_values' => 16384,
'name' => 'blue-gamma-table',
'val' => undef,
'unit' => 0,
'desc' => 'Gamma-correction table for the blue band.',
'constraint' => {
'min' => 0,
'max' => 16383,
'quant' => 0
},
'type' => 1,
'title' => 'Blue intensity',
'constraint_type' => 1
},
{
'cap' => 64,
'unit' => 0,
'max_values' => 0,
'desc' => '',
'title' => 'Extras',
'type' => 5,
'constraint_type' => 0
},
{
'cap' => 5,
'max_values' => 1,
'name' => 'lamp-off-time',
'val' => 15,
'unit' => 0,
'desc' => 'The lamp will be turned off after the given time (in
minutes). A value of 0 means, that the lamp won\'t be turned off.',
'constraint' => {
'min' => 0,
'max' => 60,
'quant' => 0
},
'type' => 1,
'title' => 'Lamp off time',
'constraint_type' => 1
},
{
'cap' => 37,
'max_values' => 1,
'name' => 'threshold',
'val' => undef,
'unit' => 5,
'desc' => 'Select minimum-brightness to get a white point',
'constraint' => {
'min' => 0,
'max' => 100,
'quant' => 1
},
'type' => 2,
'title' => 'Threshold',
'constraint_type' => 1
},
{
'cap' => 37,
'max_values' => 1,
'name' => 'threshold-curve',
'val' => undef,
'unit' => 0,
'desc' => 'Dynamic threshold curve, from light to dark, normally
50-65',
'constraint' => {
'min' => 0,
'max' => 127,
'quant' => 1
},
'type' => 1,
'title' => 'Threshold curve',
'constraint_type' => 1
},
{
'cap' => 37,
'max_values' => 1,
'name' => 'disable-dynamic-lineart',
'val' => undef,
'unit' => 0,
'desc' => 'Disabel use of a software adaptative algorithm to
generate lineart instead of relying on hardware lineart',
'type' => 0,
'title' => 'Disable dynamic lineart',
'constraint_type' => 0
},
{
'cap' => 5,
'max_values' => 1,
'name' => 'disable-interpolation',
'val' => 0,
'unit' => 0,
'desc' => 'When using high resolutions where the horizontal
resolution is smaller than the vertical resolution this disables horizontal
interpolation.',
'type' => 0,
'title' => 'Disable interpolation',
'constraint_type' => 0
},
{
'cap' => 5,
'max_values' => 1,
'name' => 'color-filter',
'val' => 'Green',
'unit' => 0,
'desc' => 'When using gray or lineart this option selects the used
color.',
'constraint' => [
'Red',
'Green',
'Blue'
],
'type' => 3,
'title' => 'Color Filter',
'constraint_type' => 3
},
{
'cap' => 5,
'max_values' => 1,
'name' => 'sensors',
'val' => undef,
'unit' => 0,
'desc' => 'Scanner sensors and buttons',
'type' => 5,
'title' => 'Sensors',
'constraint_type' => 0
},
{
'cap' => 70,
'max_values' => 1,
'name' => 'scan',
'val' => 0,
'unit' => 0,
'desc' => 'Scan button',
'type' => 0,
'title' => 'Scan button',
'constraint_type' => 0
},
{
'cap' => 32,
'unit' => 0,
'max_values' => 1,
'desc' => 'File button',
'name' => 'file',
'title' => 'File button',
'type' => 0,
'constraint_type' => 0
},
{
'cap' => 32,
'unit' => 0,
'max_values' => 1,
'desc' => 'Email button',
'name' => 'email',
'title' => 'Email button',
'type' => 0,
'constraint_type' => 0
},
{
'cap' => 70,
'max_values' => 1,
'name' => 'copy',
'val' => 0,
'unit' => 0,
'desc' => 'Copy button',
'type' => 0,
'title' => 'Copy button',
'constraint_type' => 0
},
{
'cap' => 32,
'unit' => 0,
'max_values' => 1,
'desc' => 'Page loaded',
'name' => 'page-loaded',
'title' => 'Page loaded',
'type' => 0,
'constraint_type' => 0
},
{
'cap' => 32,
'unit' => 0,
'max_values' => 1,
'desc' => 'OCR button',
'name' => 'ocr',
'title' => 'OCR button',
'type' => 0,
'constraint_type' => 0
},
{
'cap' => 32,
'unit' => 0,
'max_values' => 1,
'desc' => 'Power button',
'name' => 'power',
'title' => 'Power button',
'type' => 0,
'constraint_type' => 0
},
{
'cap' => 32,
'unit' => 0,
'max_values' => 1,
'desc' => 'The scanner needs calibration for the current settings',
'name' => 'need-calibration',
'title' => 'Need calibration',
'type' => 0,
'constraint_type' => 0
},
{
'cap' => 5,
'max_values' => 1,
'name' => 'Buttons',
'val' => undef,
'unit' => 0,
'desc' => '',
'type' => 5,
'title' => 'Buttons',
'constraint_type' => 0
},
{
'cap' => 32,
'unit' => 0,
'max_values' => 1,
'desc' => 'Start calibration using special sheet',
'name' => 'calibrate',
'title' => 'Calibrate',
'type' => 4,
'constraint_type' => 0
},
{
'cap' => 85,
'unit' => 0,
'max_values' => 1,
'desc' => 'Clear calibration cache',
'name' => 'clear-calibration',
'title' => 'Clear calibration',
'type' => 4,
'constraint_type' => 0
}
];
$VAR1 = [];
rotate facing 0
rotate reverse 0
non-duplex mode
rotate_facing 0
rotate_reverse 0
unpaper 1
OCR
Running sane_start for SANE_Handle 208295040
Getting parameters for SANE_Handle 208295040
gscan2pdf: scanning image of size 2549x3295 pixels at 8 bits/pixel
gscan2pdf: acquiring gray frame
gscan2pdf: min/max graylevel value = 48/255
gscan2pdf: read 8398955 bytes in total
Scanned page /tmp/ydrTi7mTQj/out1.pnm. (scanner status = 5)
importing scan with resolution=300
Format is P5
Header is 37
Header suggests 8398992
Expecting 8398992, found 8398992
Importing /tmp/ydrTi7mTQj/out1.pnm, format Portable anymap
Added /tmp/ydrTi7mTQj/ZWUYJ_boWj.pnm at page 1 with resolution 300
unpaper --no-blackfilter --border-align left,top --output-pages 1
--no-blurfilter --no-noisefilter --white-threshold 0.9 --layout single
--no-mask-scan --no-grayfilter --black-threshold 0.33 --deskew-scan-direction
left,top --overwrite --input-file-sequence /tmp/ydrTi7mTQj/ZWUYJ_boWj.pnm
--output-file-sequence /tmp/ydrTi7mTQj/S009gVccLz.pnm ;
Forked PID 4317
Processing sheet: /tmp/ydrTi7mTQj/ZWUYJ_boWj.pnm ->
/tmp/ydrTi7mTQj/S009gVccLz.pnm
Waiting to reap process at /usr/bin/gscan2pdf line 10566.
Reaped PID -1
Forked PID 4323
Defining page at 611.76pt x 790.8pt
Adding /tmp/ydrTi7mTQj/S009gVccLz.pnm at 300 dpi
Process 4323 exited.
Closing SANE_Handle 208295040
Exiting via sane_exit
--
PDF is split in grayscale
https://bugs.launchpad.net/bugs/619187
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