Description of problem:

With my scanner Epson Perfection 1250 and Xsane (plustek backend) I have the scans like this:

http://www.kensan.it/tmp/vertical_band.jpg

This is the correct scan:

http://www.kensan.it/tmp/original.jpg

This problem occurs whit many other distributions like Fedora, Ubuntu, ecc. I suppose it is an error in porting of old 32 bit Plustek backend to 64 bit platform.

These are the messages that other people reported all over the Internet about the same problem:

> Color error with Epson Perfection 1250.
> Hello:
> I use Ubuntu 10.04 and an Epson Perfection 1250 scanner. I'm experiencing a 
> weird problem which is related to colours.
> Regardless I use Simple Scan or XSane, after doing at least 1 scan (complete 
> or partial) or a few previews, the programs start to act goofy and show a 
> wrong colour composition:
http://ubuntuforums.org/showthread.php?t=1472373

> Epson Perfection 1250 Scanner Color Banding
> Postby andy17mb on Thu Jun 26, 2014 7:00 am
> Hi All,
> I'm having scanning issues... I'm using Mint 17 Cinnamon 64bit and have 
> libsane 1.0.23-3ubuntu3.1 installed. I've tried scanning with Simple scan, 
> XSane and Gscan2pdf (so the Sane backend - plustek:libusb:004 for my Epson 
> Perfection 1250 - is the same) and intermittently I am getting colour tinted 
> scans when i scan in colour (eg left half of the image is green tinted and 
> right half is red tinted or wholly yellow or pink background).

> Scanning several pages with my flatbed scanner works fine for the first
> two pages; the subsequent pages will have wide coloured vertical bands
> in the background (black for a grayscale scan).
> This is true for the 64-bit versions of Fedora 16, 17 and 18; with the
> 32-bit versions of the mentioned distributions there is no problem.
> Scanning using xsane or simple-scan produce both the misbehaviour.

Maybe the problem is for the 64 bit system, like this supposition:

> 314021 sane-find-scanner sees scanner but does not recognize it on 64 bit, 
> works fine on 32 bit
> 304296 plustek: Color problem on amd64
> 312505 Epson Perfection 1250 works but, after 1-3 scans, it shows 2 vertical 
> bands of different tones.
> 314019 my scanner has a problem in the 64-bit systems but works fine with the 
> same systems in 32 bit
>
> Maybe same class:
> 313712 Different colors on the right and the left half of the scan
>
> The Plustek Backend (maybe U12 and plustek_pp) needs to be revised to get rid 
> of the assumption u_long/long data types are only 32 bits wide.

The workaround it this:

Solution:
Change from 0 to 1 the parameter altCalibration in /etc/sane.d/plustek.conf

but the colours are not very good, they must to be corrected. Anyway the result is not optimal.

Same bug:


Version-Release number of selected component (if applicable):

Mageia 5
Epson perfection 1250
ID 04b8:010f Seiko Epson Corp. GT-7200U [Perfection 1250/1250 PHOTO]


How reproducible:
Not every time the scans are weird, it is random. In this try I found the first 2 scans are correct and the other five have coloured vertical band.

Steps to Reproduce:
1. open xsane
2. press scan button
3. scan ten times the same image
4. after the firsts correct scans, the other have coloured vertical band