Local contrast

[Laurent Espitallier]

Hi,

I miss a function in digiKam : Local Contrast Enhancement.

Does it exist or not ? (Maybe I don't look in the right place...)

If not, is it planned for a future release ?

Thanks,

Laurent.
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[Gilles Caulier-4]

2009/5/2 Laurent Espitallier <[hidden email]>:
> Hi,
>
> I miss a function in digiKam : Local Contrast Enhancement.
>
> Does it exist or not ? (Maybe I don't look in the right place...)
>
> If not, is it planned for a future release ?
>

Not implemented.

There is a wish in bugzilla if i remember...

Gilles Caulier
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[Markus Spring]

Laurent Espitallier schrieb:
> Hi,
>
> I miss a function in digiKam : Local Contrast Enhancement.

Local Contrast Enhancement basically is Unsharp Masking with the parameters
radius 60, strength 0,2 and treshold 0

I do it this way in digikam before using refocus for detail sharpening. You can
have a look in
http://www.luminous-landscape.com/tutorials/contrast-enhancement.shtml for
further details

Best regards

Markus
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[Laurent Espitallier]

Le 02/05/2009 15:17, Markus Spring a écrit :

> Local Contrast Enhancement basically is Unsharp Masking with the parameters
> radius 60, strength 0,2 and treshold 0
>
> I do it this way in digikam before using refocus for detail sharpening. You can
> have a look in
> http://www.luminous-landscape.com/tutorials/contrast-enhancement.shtml for
> further details
>
> Best regards
>
> Markus
>    

Thanks Markus ! I just found one weakness : applying the effect takes a
long time.

Thanks to Gilles too for the quick reply.
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[Gilles Caulier-4]

2009/5/2 Laurent Espitallier <[hidden email]>:

> Le 02/05/2009 15:17, Markus Spring a écrit :
>> Local Contrast Enhancement basically is Unsharp Masking with the parameters
>> radius 60, strength 0,2 and treshold 0
>>
>> I do it this way in digikam before using refocus for detail sharpening. You can
>> have a look in
>> http://www.luminous-landscape.com/tutorials/contrast-enhancement.shtml for
>> further details
>>
>> Best regards
>>
>> Markus
>>
> Thanks Markus ! I just found one weakness : applying the effect takes a
> long time.
>
> Thanks to Gilles too for the quick reply.

Well i suspected that you talk about contrast mask as LightZone do...

Gilles

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[Laurent Espitallier]

Le 02/05/2009 16:20, Gilles Caulier a écrit :

Well i suspected that you talk about contrast mask as LightZone do...

Gilles
  

In fact I never used LighZone so I can't say I would like such contrast mask. Before I used DxO Optics Pro if you need a reference.

Actually there's two solutions for me I think :

-using the unsharp mask filter in digiKam
-using the other method in GIMP or Krita

But I don't know which one is better.

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[Markus Spring]

Laurent Espitallier schrieb:
> Thanks Markus ! I just found one weakness : applying the effect takes a
> long time.

Yes, but you encounter the same effect in all software, at least those that I
know. It is mereley a matter of mathematics, as it goes through an n-pixel
radius around every pixel in the image....
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