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  #51  
Old 05-30-2006, 09:20 AM
byRo's Avatar
byRo byRo is offline
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Had to do a rush translation (Portuguese -> English ) yesterday for my daughter.

I've got a lot more ideas to try out, hope to finish it tonight.

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  #52  
Old 05-30-2006, 07:38 PM
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byRo byRo is offline
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OK, I uploaded the sketch filter to the site.

In the atachaments, Default settings and two of the presets.

Attached Images
File Type: jpg FF-sketch-byRo-default.jpg (98.3 KB, 15 views)
File Type: jpg FF-sketch-byRo-preset4.jpg (97.8 KB, 14 views)
File Type: jpg FF-sketch-byRo-preset7.jpg (99.2 KB, 18 views)
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  #53  
Old 06-06-2006, 09:56 AM
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Cameraken Cameraken is offline
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This is fun. Isn’t it?


I’ve been playing with your convolution filter (lots of uses for this as FF can’t provide this component)

I think I may have found an error in the code

In the blend component at the bottom. Please see my picture. I have marked what I think is wrong in Red and the correction in Blue.

Could you please take a look at this and see what you think?

I think I may attempt a 7x7 Kernel.
Has anyone got any good painterly kernels?


Ken.
Attached Images
File Type: jpg Correction.jpg (99.4 KB, 18 views)
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  #54  
Old 06-06-2006, 03:46 PM
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byRo byRo is offline
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Ken, I think you're right. (actually, I made two errors not one )

I don't have a copy of the filter here, and I just discovered that I can't download from the site, 'cuz I've already done that.


As I remember the version before this one had the connection that you corrected. However, then I remembered that the central difference component should have double the weight of the others. I was trying to do that, but looking again, I think I got it all wrong .

7 x 7? More than the 48 offsets, the big problem would be in the weights. Just trying to do 3x3 with simple weights [1 2 1] I got into trouble . Imagine 7 of them!
(or, maybe, you were just kidding?)

Quote:
Originally Posted by Ken
Has anyone got any good painterly kernels?
Not a kernel, but I do have a filter in the "unfinished" section using distorted tiling which may lead to something interesting.

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  #55  
Old 06-06-2006, 03:59 PM
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Cameraken Cameraken is offline
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Hi Rô.

I have been reading this thread
http://www.retouchpro.com/forums/sho...ghlight=kernel

but I am still a little confused about how to do the conversion to FF

Chris Russ posted the laplacian filter as
-1
-1 4 -1
-1
also here
http://www.homepages.inf.ed.ac.uk/rbf/HIPR2/log.htm#3
and the Sobel is here.
http://www.homepages.inf.ed.ac.uk/rbf/HIPR2/sobel.htm
and the Roberts Cross
http://www.homepages.inf.ed.ac.uk/rbf/HIPR2/roberts.htm
(Hypermedia Image Processing Reference from the University of Edinburgh is an excellent source of info.)

I still can’t figure the logic with your filter. The pixels are compared with a difference blend mode and then blended with screen? I know there is no Add and Subtract (yet) and so difference should be OK for a subtract {result := abs(a-b)} but why use screen? Does this bring it back to a Plus? Screen is the opposite of Multiply. {(a,b) = 1 - (1-a) * (1-b)}

So how would I make a Laplacian Filter? Would it be difference mode to compare and then normal mode to blend?
And what would be the best way to increase the effect if the numbers in the kernel are bigger than 1?

So, if I wish to apply 0,1.0.1.1.1.0,1,0
To pixel values 164,188,164,178,201,197,174,168,181
I would add the surrounding pixels (932) and divide by 5 (186).
So I would change 201 to 186.

So how would I apply this in FF ?
Also how would I apply 0,-1.0.-1.-1.-1.0,-1,0 ?

Attached is a 5x5 Filter. I give up with 7x7. I don’t have a big enough monitor


Ken.
Attached Files
File Type: zip Convolution 5x5.zip (1.6 KB, 2 views)
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  #56  
Old 06-06-2006, 07:05 PM
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byRo byRo is offline
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Ken,
First, thanks for spotting the error. I have corrected it.

Vladimir had cleared my queue so that I could submit the "Adaptive Tiling" filter and now I'll have to wait until that gets through the process.

As to the workings....
There are three differences in each direction with the middle having double the weight of the others. As per your link the weighted sums of the differences in each direction will be "Gx" and "Gy".

The screen formula 1 - (1-a) * (1-b), can be rearranged to a + b - ab.
With a bit of sleight of hand (or just assuming that a and b are small - well sort of ) that reduces to just a + b, an accepted alternative.


Laplacian
Your matrix got a bit messed up in the post (extra spaces get eliminated) that would be:
00 -1 00
-1 +4 -1
00 -1 00


See atachment: Invert the original and set up 4 offsets, one in each direction.
As the differences are now signed (not absolute) then the subtraction can be done blending 50% of one with 50% of the other inverted - note that now mid-grey is our zero and the values can be positive and negative.
To sum them up we would need a Linear Light blending mode. Lacking this maybe Hard Light won't be too far off.

Got to run now...try and reply some more later, OK?

Attached Files
File Type: zip Laplacian.zip (991 Bytes, 1 views)
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  #57  
Old 06-06-2006, 09:02 PM
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byRo byRo is offline
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Ken, I had a look at your 5 x 5.

I noticed that you left all the blenders at their default value of 50%.
I changed them all to 100%, and also changed the summing points from difference to screen.

I don't have the faintest idea what this thing is actually calculating, but I just loved the result.

Attached Images
File Type: jpg FF_Kens5-5.jpg (98.7 KB, 19 views)
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  #58  
Old 06-07-2006, 09:07 AM
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Steve Conway Steve Conway is offline
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F.Y.I. FF users. Found out there is a built-in device in this software, at least in the beta version, to detect what you do with, and what type of filters you make with it. Not sure if there is anything else it's peeking at?

Would like to try this, as everyone seems pleased with the results, but am a little leary of this bit of info.

Steve
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  #59  
Old 06-07-2006, 09:18 AM
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byRo byRo is offline
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Steve, I saw this too - but I also saw somewhere that you can turn it off.

Doesn't worry me too much though.
Vladimir and the guys are serious folk and they are only interested in feedback about their filter.
(or they fooled me real good!)

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  #60  
Old 06-07-2006, 02:55 PM
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Cameraken Cameraken is offline
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Hi Steve.

Here is the information about the info that FF use.
http://www.filterforge.com/more/usagestats.html

However it can be switched off in the preferences if you wish. There is also a message which asks if it’s OK to send the info before it is sent.

FF is worth trying. Some wonderful effects can be achieved. Just look what Vladimir had to say about Byro’s filter.

Quote:
Vladimir Golovin
Administrator
This one is absolutely brilliant from the technical standpoint. A month ago I wouldn't believe that this is made in Filter Forge:

http://www.filterforge.com/filters/471.html
Posted: June 7, 2006 4:14 am
Ken
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