[sane-devel] Descreen feature

[Jens Gulden]

René Rebe wrote:
>> You can use ImageMagick, ExactImage, Gimp, etc. to perform those tasks.

You also might want to take a look at unpaper: http://unpaper.berlios.de/

The algorithms used in unpaper are still very simple (some kind of blurring, a noise-filter, 
black-area removal, auto-rotation, etc.), but it bundles some useful features for post-processing in 
a single application.

Jens

ps. greetings from Helmholtzstr./Charlottenburg :-)
> René Rebe ... Sitz: Berlin, Amtsgericht Charlottenburg


René Rebe schrieb:
> On Friday 27 July 2007 09:39:40 Bertrik Sikken wrote:
> 
>>Quentin Bierent wrote:
>>
>>>Hi there
>>>
>>>I've been checking sane from time to time and a key feature is still 
>>>missing at this time
>>>every serious scanner user need descreen feature to get clean scan.
>>>Goole shows it's been various requests about this feature (aka detramage)
>>>
>>>Every other descreen "workaround methods" are quality degrading (blur, 
>>>despeckle etc etc) only a specific and efficient descreen algorythm 
>>>(with LPI and screens angles settings) can do a good job for 
>>>profesionnal quality.
>>>This is the only way to get a good resolution scan with a low print 
>>>quality original (halftone pictures in newspaper can be acquired and 
>>>smoothed WITHOUT sacrifying resolution and final quality)
>>>
>>>This feature is available on every serious scanner software (agfa, 
>>>binuscan...)
>>>
>>>I will send some examples later.
>>>
>>>I am aware this feature is tricky to implement but  it will for sure 
>>>lift SANE  to new heights...
>>
>>What you propose sounds much like an image processing step, while
>>sane is (currently) more about simply getting the data from the
>>scanner.
>>Before adding image processing to sane itself, I think there should at
>>least be some kind of framework where it can fit in cleanly.
> 
> 
> This "commercial", "binary only" Windows junk software pieces
> also only do blur and re-sharpen and the like.
> 
> You can use ImageMagick, ExactImage, Gimp, etc. to perform those
> tasks.
> 
> Yours,
>