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 Post subject: Unsharpen mask filter
PostPosted: 16 Oct 2006 10:29 
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Hello!
I'd appreciate very much if someone could point me to any "unsharpen mask " kind of filter, to process digital pictures.
Thanks in advance.
Jes.


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 Post subject:
PostPosted: 16 Oct 2006 12:40 
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Hi jesito,

I'm surprised by your question.
Opposite of sharpen, in my lexical tools, is soften.
Two ways are available to soften a picture (native PF6 tools) :
- Menu Filter / Soften
- Menu Filter / Relief / Soften relief

Any mask cann't solve such a request, in my mind.
All the plugins compatible with PF6 are downloadable on the official site.

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 Post subject:
PostPosted: 16 Oct 2006 14:20 
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Hi Tom:

Many thanks for answering.
In the photography terms, "Unsharpen mask" is not related to the "mask" concept in photofilter. Since most of SLR cameras have a filter in front of the CCD sensor, the pictures as taken from the camera, are a little "softened" and need to be "sharpened", (a common practice that is recommended by most of the camera manufacturers, like Canon for instance). You don't get the real sharpness from a picture until you apply what is called "unsharpen mask" on some picture retouching plugins, "low pass filter" on some others, or "intelligent sharpening". I belive this is referred more to the concept that to the real fact of having a "mask" to "sharpen", (I agree with you, this should be an algorithm not a mask in the Photofilter concept).

Here you can get a better description on this topic:

http://www.scantips.com/simple6.html
http://www.mic-d.com/java/digitalimagin ... index.html

The last one describes the algorithm and has an embedded java interpreter, so you can experiment with the resulting effects of this so called "unsharpen mask" algorithm.


Best regards,
Jes.


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 Post subject:
PostPosted: 16 Oct 2006 15:50 
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Hi jesito!

Suggestion: try the PhotoFiltre Studio version (30 days free) with the 8bf plugin named Blur and Sharpen FF plug-ins. Some comments and download link here: http://www.aim-dtp.net/aim/photoshop/v5 ... actory.htm

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 Post subject:
PostPosted: 16 Oct 2006 16:06 
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Corwin13 wrote:
Hi jesito!

Suggestion: try the PhotoFiltre Studio version (30 days free) with the 8bf plugin named Blur and Sharpen FF plug-ins. Some comments and download link here: http://www.aim-dtp.net/aim/photoshop/v5 ... actory.htm


It looks like it's the way... Thanks!
I'll try it.

Best regards,
Jes.


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 Post subject:
PostPosted: 16 Oct 2006 16:16 
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Ok, it seams clearer, :)

thanks for these very interresting links.
In fact, an Unsharp Mask do exactly the opposite of what his name suggests. :shock: :shock: :shock:
I didn't know this lexical wonder. :roll:

So, i think you want enhance, increase and control a sharpen effect.
- in PF6 freeware, you can find 4 tools in Menu Filter : Sharpen. But i think you've found it.
- However you are perhaps not acquainted with Menu Edition / Fade
This tool can be applied after quite all filters, and offers asset of direct view on the whole workspace.
This is a very usefull function.
- in PF Studio release (efficient shareware for a cheap price) you can use some 8BF filters like Clarity from Xero web site (freeware) :
http://www.xero-graphics.co.uk/freeware.htm
A very powerful tool.

I hope it answer your request. :)

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 Post subject: Blur-Sharp
PostPosted: 15 Jan 2007 5:10 
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R,G,B: ctl(1)<0 ?
(cnv(1,1,1,1,1,1,1,1,1,9) * abs(ctl(1)) + c * (100+ctl(1)))/100 :
(cnv(-1,-1,-1,-1,16,-1,-1,-1,-1,8) * ctl(1) + c * (100-ctl(1)))/100

I use this formula for Focus in my 8bf plugins. If Antonio wants to use it in Photofiltre, it's fine with me. It works with a single slider set at zero to begin with. It's range is -100 for full Blur and +100 for full Sharpen. The Blur and Sharpen are just like the PFS buttons. Any setting above zero will sharpen gradually. Settings below zero will blur gradually.

The c in the formula could be src(x,y,z) instead. It stands for the original unblurred or unsharpened pixel.

The slider code is: ctl(1): "Focus ", range=(-100,100), val=0

I wouldn't mind having a button to call up a Focus slider instead of the Blur and Sharpen buttons. This way there would be no need to Fade the result.

This is just a suggestion. It took me a long time to get the formula figured out, even though its very simple. If you want it, it's yours.

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 Post subject:
PostPosted: 17 Jan 2007 12:39 
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I'm working on a new unsharp mask function with dynamic matrxi convolution, i will compare results :wink:


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 Post subject:
PostPosted: 24 Jan 2007 21:51 
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You can try the beta 9. In the filter Reinforce (unsharp mask) i use a dynamic laplace matrix. The result is good but very slow with high radius values

http://www.photofiltre-studio.com/tmp/pfs810.zip


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