Default Fractional Scan Dimensions Give Invalid Parameter Error

[connorb777]

Describe the bug Default scan dimensions cause invalid parameter error when attempting to preview. This seems to be the result of the default x dimension being 228.6, since scanning regularly works fine with whole numbers, but I can't figure out where I should go to change this.

To Reproduce Steps to reproduce the behavior:

1. Install using one-line installer command
2. Go to server address (127.0.0.1:8080)
3. Click preview

Expected behavior Scanner scans a preview

Screenshots

Client (please complete the following information):

• Browser: Firefox

Server (please complete the following information):

• OS: Raspbian 11
• Node version: v12.22.12
• NPM version: 8.3.0
• Docker version: 23.0.4

Logs https://pastebin.com/ZzxgbLQX

Additional context

[sbs20]

Odd.

To answer your specific question, this recipe should help you.

So the app is running:

/usr/bin/scanimage -d hpaio:/usb/hp_LaserJet_3030?serial=00CNBM002126 --source Auto --mode Color --resolution 100 -l 0 -t 0 -x 228.6 -y 381 --format tiff --brightness 0 --contrast 0 -o data/preview/preview.tif

Which results in

Error: /usr/bin/scanimage -d hpaio:/usb/hp_LaserJet_3030?serial=00CNBM002126 --source Auto --mode Color --resolution 100 -l 0 -t 0 -x 228.6 -y 381 --format tiff --brightness 0 --contrast 0 -o data/preview/preview.tif exited with code: 1, stderr: scanimage: setting of option --br-x failed (Invalid argument)

The scanner is reporting:

Apr 24 21:35:04 raspberrypi server.js[10934]:         '  Geometry:\n' +
Apr 24 21:35:04 raspberrypi server.js[10934]:         '    --length-measurement Unknown|Unlimited|Approximate|Padded [Padded]\n' +
Apr 24 21:35:04 raspberrypi server.js[10934]:         '        Selects how the scanned image length is measured and reported, which\n' +
Apr 24 21:35:04 raspberrypi server.js[10934]:         '        is impossible to know in advance for scrollfed scans.\n' +
Apr 24 21:35:04 raspberrypi server.js[10934]:         '    -l 0..228.6mm [0]\n' +
Apr 24 21:35:04 raspberrypi server.js[10934]:         '        Top-left x position of scan area.\n' +
Apr 24 21:35:04 raspberrypi server.js[10934]:         '    -t 0..381mm [0]\n' +
Apr 24 21:35:04 raspberrypi server.js[10934]:         '        Top-left y position of scan area.\n' +
Apr 24 21:35:04 raspberrypi server.js[10934]:         '    -x 0..228.6mm [228.6]\n' +
Apr 24 21:35:04 raspberrypi server.js[10934]:         '        Width of scan-area.\n' +
Apr 24 21:35:04 raspberrypi server.js[10934]:         '    -y 0..381mm [381]\n' +
Apr 24 21:35:04 raspberrypi server.js[10934]:         '        Height of scan-area.\n' +

So on the face of it, everything "should" just work.

Anyway, you've verified that it's definitely the decimal that's doing it? What do these do?

• /usr/bin/scanimage -d hpaio:/usb/hp_LaserJet_3030?serial=00CNBM002126 --source Auto --mode Color --resolution 100 -l 0 -t 0 -x 228.5 -y 381 --format tiff --brightness 0 --contrast 0 -o data/preview/preview.tif
• /usr/bin/scanimage -d hpaio:/usb/hp_LaserJet_3030?serial=00CNBM002126 --source Auto --mode Color --resolution 100 -l 0 -t 0 -x 227.6 -y 381 --format tiff --brightness 0 --contrast 0 -o data/preview/preview.tif
• and /usr/bin/scanimage -d hpaio:/usb/hp_LaserJet_3030?serial=00CNBM002126 --source Auto --mode Color --resolution 100 -l 0 -t 0 -x 228 -y 381 --format tiff --brightness 0 --contrast 0 -o data/preview/preview.tif

[vaneno]

Hello. Same problem with a HP3052 . Preview option gives me the same error as the op. The scanimage -A show the geometry as 228.6 .

Try geometry commands: original 228.6 : error with the 228.5 : works nice with 227.6 : works nice with 228: works nice

I install hplip in docker image to access the scanner.