2012. április 24.

Canon LiDE 210 scanning statistics

Scanning speed:
only about 3 pages/minute.
scan mode Lineart, Dpi 300, Threshold 40, Threshold Curve 50

Error type #1:
Scanner head does not move. This produces an empty page.
Happens not every time, but only in cases when I press scan button before the head returns to the original position.

2012-04-24: out of 293 pages 11 pages: #4, #6, #11, #82, #143, #191, #205, #214, #231, #274, #278.

Error type #2:
Scanning error. Produces messed up image.

2012-04-24: out of 293 pages 1 page: #113.

2012. április 15.

Learning to type

I'm trying out kTouch now, and creating a set of meaningful words for my own practice. Well, practicing letters is a must do, but it's much better to have regular words too...

2012. április 13.

Chrome & Shockwave Flash using 100% of CPU

I'm just making a note here:

Shockwave flash running on Google Chrome uses about 100% of my CPU capacity.

This causes the cooling ventillation to run high speed, which produces much noise, and it also causes the machine to gain a quite high heat.

2012. április 3.

Testing gscan2pdf output formats

Lineart 300dpi 260x200mm scans
123 pages

Downsample to: no downsampling

Compression: Automatic
FileSize: 29.1MB

Compression: LZV
FileSize: 29.1MB

Compression: ZIP
FileSize: 29.1MB

Compression: PackBits
FileSize: 47.4MB

G3 and G4 encoding didn't work for me.

Compression: PNG
FileSize: 30.4MB

Compression: JPEG 75% compressed
FileSize: 221.7MB

Compared to my method of converting pnm through ps to pdf:
FileSize: 22.4MB (This is the smallest pdf on 300dpi)

FileSize: 13MB

Compared to my method of converting pnm to djvu:
FileSize: 13MB (Equal size)

gscan2pdf Session
FileSize: 591.1MB

Sum FileSize: 114.6MB

Sum Filesize: 33.5MB

not working.

Can change compression method (LZW, ZIP, JPEG, PackBits, G3, G4, none)
not tested

Can change compression quality
not tested

2012. április 2.

Using the Canon LiDE 210 on Ubuntu

Now, that I got "Alice" (laptop) to recognize "Susy" (scanner), I will try out a variety of scanning software to pick the best for my needs.

Here's a list of "frontends" that work with SANE (Scanner Access Now Easy)
(Here's a daemon for mapping scanner buttons, for the case I find the ideal software.)

This is what I do:
a) I digitalize black-and-white documents in large amounts.
b) I digitalize color photographs
This is what I need a scanning program to be:
b) accurate in color

The winner of FAST scanning of monochrome documents is:

Reviews follow below.

a) FAST scanning of monochrome text documents

Command Line Frontends

installation: comes with SANE.

- easy to use
- easy to define scan area (x and y in millimeters)
- can't be automated to scan repeatedly to numbered documents. -> NOT ANYMORE!


scanimage --mode Lineart --resolution 1200 >img1200.pnm
approx 50 seconds. it is so detailed it is basically grayscale. 17.1MB 10096x14173px
scanimage --mode Lineart --resolution 600 >img600.pnm
approx 10 seconds. good quality. a bit noisy. 4.3MB 5048x7086px
scanimage --mode Lineart --resolution 300 >img300.pnm
approx 6 seconds. good quality. same amount of noise as on res600. maybe it's better to scan res600 and resize 50% than to scan res300. 1.1MB 2520x3543px
scanimage --mode Lineart --resolution 150 >img150.pnm
approx 6 seconds. Quality not acceptable. 271.6KB 1250x1771px

further testing: I'll have to play with threshold and other parameters to maybe get a better result.

installation: scanadf needs the SANE source code to be patched to install it. this means I should patch, configure, make and make install, which, now, I will not do.

Graphical Frontends

installation: through synaptic

- can configure all what scanimage can
- can save files numbered
- can do postprocessing
- no pnm, only tiff or jpeg


Lineart with various resolutions and output file type

for some reason Eikazo likes to die on me. I set some parameters, scan, and then I cannot change anything anymore, and cannot scan anything anymore...

This is an archiving software. yes, it can scan using SANE, but it's main purpuse is to crate tagged, searchable a database from all the files you scan.
I don't need such a thing. I don't install.

- configuration is the same as scanimage with the same defaults
- can post-process: rotate, clear, OCR
- can save to a variety of files (pdf, gif, jpg, png, pnm, ps, tif, text, gscan2pdf-session, djvu). pdf and tif are with a variety of options on compression or downsampling.
- it's quick to scan. I just have to press the button everytime I'm finished positioning the next page.
- you can click "scan" button to queue the next scanning to save some seconds.
- I found none so far.
- takes 13 seconds to reposition the head. But this is probably a hardware thing.
Testing #1:

I easily made the scanner to go post it's scannig size limits. No catastrophe happened, thank god. SANE ReadMe warns, that this type of abuse can damage the scanner hardware.
Okay, I think it was the "Page Options" "All" which is probably for Automated Document Feeder. I don't dare to change # to more than 1. Anyway, it's written in scanadf's manual: "Use of this program with backends that do not support ADFs (e.g. flatbed scanners) will likely result in repeated scans of the same document. In this case, it is essential to use the start-count and end-count to control the number of images acquired."
scanning quality, size and time results are the same as in scanimage.

Testing #2

In the reality, it takes 19 seconds to scan a 200x280mm page. It takes 6 seconds to scan 300dpi, and it takes 13 seconds to reposition. This is awful. I will have to see if there is something to be done to fasten the repositioning.

Canon LiDE 210 flatbed scanner on Ubuntu

So I got this brand new flatbed scanner: Canon LiDE 210.

I have read here, that it works with Ubuntu. Actually that was a good reason for picking this scanner. Remember, I still have the Ubuntu 10.04 LTS running on Alice.

This is how I got it work:
1.) sudo add-apt-repository ppa:plaxx/random-fixes
2.) Open System> Administration> Software Sources
...go to "Other Software" tab
Edit "http://ppa.launchpad.net/plaxx/random-fixes/ubuntu lucid main"
Change "lucid" to "maverick"
(leave the source checked!)
3.) sudo apt-get update
4.) sudo apt-get install libsane sane-utils
5.) reboot

In the process of trying I installed the latest SANE and libusb, I don't know what kind of effect this had on the outcome.

This is what happened before I got "Susy" (this is how I named the LiDE 210) to work:
1.) I unboxed the scanner. Made a video of it, 'cause this little thing is amazing.
2.) Plugged it in the USB...
3.) ...nothing happened.
Oh, no problem, this wasn't Ubuntu if everything worked out of the box.

So let's see, what we can do to get the scanner running:
1.) Check the SANE site for details on how the scanner is supported:
genesys1.0-62CanoScan LiDE 210USB0x04a9/0x190acompleteGL124 based, resolution from 75 to 2400 dpisane-genesys
2.) Install the newest SANE version (1.0.22)
3.) Install libusb-dev files through Synaptic
4.) Install the newest libusb version
5.) Plugging in the scanner again...
...still nothing happens.
6.) Restarting the computer...
...still nothing
7.) Trying out on Windows7...
...it works! Yeah! At least the product is functioning for sure.

Okay... let's go another round... how should an usb scanner work on Ubuntu?
1.) Checking Ubuntu Documentation.
2.) Checking Support Forums... Found something worth a try. (Changing the bottomlesspit thing's repository from lucid to maverick, as it is originally for maverick.)
3.) Doing the update end install thing again
4.) Restarting...
...and it works! :-) Finally.