[sane-devel] HP5470c scanner nearly working!

[Thomas Soumarmon]

Hi Martijn,

I began about one month ago to do the same work you've done. Unfortunately 
about 2 weeks after the beginning my spare time reduced a lot, so I must say 
that it slowed down a lot, reaching a 0 speed for about 1 month.

There is now a Sourceforge project set up for hp5400 series SANE backend : 
http://sourceforge.net/projects/hp5400backend/
and 
http://hp5400backend.sourceforge.net/
I hope you can get some information there.

I think it would be worse you add your work on that project. As you might have 
more time than I, would you want to be added as an administrator on that 
project ?

Another thing. The test program you wrote compiled perfectly and appearently 
worked ok. I email you the log directly.

Have a nice day.


Le Mercredi 19 Février 2003 23:52, Martijn van Oosterhout a écrit :
> [Please CC any replies so I can more easily find them through the rest of
> my mail. Thanks.]
>
> I finally got totally sick of waiting for someone to make my scanner work,
> so I did it myself. The results are on my webpage:
> http://svana.org/kleptog/hp5470/. I'm doing it over USB.
>
> Situation is:
> 1. It finds the scanner and warms up the lamp
> 2. It performs two calibrations scans like in windows
> 3. Performs the preview scan and dumps it to disk
>
> This is only a test program, not a backend. Things still to do:
> 1. Actually use results of calibration scans. Anyone who has an idea how
> scanners are calibrated, point me at some info, please.
> 2. Do gamma correction. Right now the gamma correction is linear. Again,
> someone who knows the theory would be helpful here.
> 3. Decipher data format. Looks pretty straight forward. R, G, B seperate.
> 4. Work out the parameters for the different scan types (B&W, 24-bit, etc).
> 5. Turn it into a SANE backend. Hopefully this will not be hard.
> 6. Make negative/slide addon work.
>
> Hopefully not far to go now. If anyone can test my code it would be much
> appreciated. Note this version produces a *lot* of debug info. Please send
> it all for bug reports. Thanks.
>
> I'd like to thank Bertrik Sikken for doing some of the ground work.
>
> Have a nice day,