Re: [sane-devel] Maybe I am on the wrong list ...

[doark]

On Sat, 01 Jul 2017 18:06:50 +0200
"Dr.-Ing. Dieter Jurzitza"  wrote:
> Dear listmembers,
> maybe I am on the wrong list because my problem might be application - 
> specific, however.
> 

I've sent several messages like this one before, and normally you send a
meaningful subject and then apologize, that way people learn of what
you're asking before dismissing it because you're too busy apologzing to
tell people what you need.


> I have set up a HP 7400C scanner, supported by the avision backend, it
> is detected and working. So far, so good.
> 
> Now, if I scan a black and white printed text with xsane and adjust all 
> parameters to default, 300dpi, Gray, contrast and brightness set to 0, 
> (=100%), the resutls are nice quality scans, black is black, background
> is white.
> 
> In contrast, attempting to do the very same with scanimage, calling:
> 
> scanimage --mode Gray --contrast 0 --brightness 0 --resolution 300 >
> outfile
> 
> the resulting picture in "outfile" (same printed text as above) is very 
> bright, grey rather than black. Modifying brightness is making the
> result worse, modifying contrast as well. I cannot achieve the same
> result as with xsane - what makes me wonder as I had had expected to
> work the same way 
> 
> Any ideas / hints for me? I could provide resulting scans for
> explanation, however, I think I cannot upload anything.


Use a post processing tool, like imagemgick, or gimp.
You might also be interested in OCR.

Sincerely,
David

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[sane-devel] Maybe I am on the wrong list ...

[Dr.-Ing. Dieter Jurzitza]

Dear listmembers,
maybe I am on the wrong list because my problem might be application - 
specific, however.

I have set up a HP 7400C scanner, supported by the avision backend, it is 
detected and working. So far, so good.

Now, if I scan a black and white printed text with xsane and adjust all 
parameters to default, 300dpi, Gray, contrast and brightness set to 0, 
(=100%), the resutls are nice quality scans, black is black, background is 
white.

In contrast, attempting to do the very same with scanimage, calling:

scanimage --mode Gray --contrast 0 --brightness 0 --resolution 300 > outfile

the resulting picture in "outfile" (same printed text as above) is very 
bright, grey rather than black. Modifying brightness is making the result 
worse, modifying contrast as well. I cannot achieve the same result as with 
xsane - what makes me wonder as I had had expected to work the same way 

Any ideas / hints for me? I could provide resulting scans for explanation, 
however, I think I cannot upload anything.

Regards, many thanks for your efforts




Dieter Jurzitza

-- 
---
Dr.-Ing. Dieter Jurzitza76131 Karlsruhe


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