[sane-devel] HP ScanJet G3010 vertical stripe

[JKD]

Hello Maciej,

> I've recently purchased HP ScanJet G3010. I did few scans, and I've
> noticed an artifact: part of the image is brighter than the rest, with
> a vertical border. Here are three examples:
>
> http://automaciej.rootnode.net/test-0001-1024px.png
> http://automaciej.rootnode.net/test-0002-1024px.png
> http://automaciej.rootnode.net/test-0003-1024px.png
>
> It's not possible to avoid the stripe by moving the photo to the left
> or to the right, because the stripe moves with it. Some photos get
> scanned with no stripe. Others get a stripe every single time.

The main problem is that calibration process is disabled in hp3900 backend and 
it's using an emulation to correct image on the fly which seems to be poor 
for desired quality. It seems that in some scanner models image looks better 
than in yours. I'm working to support native calibration during several 
months (offset/gain and dark/white shading) and I'm getting good results but 
there are still some vertical stripes on the right side of image so I won't 
update backend yet. May be you want to test my current sources (compiling a 
standalone application). If so, let me know.

Jonathan Bravo Lopez