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Gaussian Blur and the High-Pass Filter - What gives?

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  #11  
Old 01-07-2005, 12:39 PM
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byRo byRo is offline
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Hi there, Stroker - welcome in

Quote:
Originally Posted by Stroker
"Photoshop does not have a direct blending option for subtraction"
Linear Dodge, but it's 'upside-down'.
Just invert.
Quite true, linear dodge does do subtraction, however I would refer you to observation 1 (at the end of the tutorial). In this case we are using a system where the pixel values are considered as going from -128 to +127. The Linear Dodge works using 0 to 255.
The basic difference is that if we take two identical images and apply the Linear Dodge we will end up solid black, while in the (more complicated) method used here we end up with mid-gray.
Quote:
Originally Posted by Stroker
Excellent article on High Pass for some more nitty-gritty:
http://www.3dgate.com/techniques/200...0625hajba.html
Thanks - this was indeed one of my sources of inspiration and I had lost the link.

byRo
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  #12  
Old 02-04-2006, 07:45 PM
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Cameraken Cameraken is offline
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Hi Rô.

Thanks for another great tutorial. The link mentioned above is now dead.
Do you still have this info?

Quote ”Next up:
– choosing the radius, without the guesswork”

I had difficulty finding this Tutorial. The link is here
http://retouchpro.com/tutorials/?m=show&id=149


Ken.
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  #13  
Old 02-05-2006, 02:27 PM
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byRo byRo is offline
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Wow, I am feeling lucky today!

Did a Google for 3d high-pass texture and the article was first on the list.
http://www.gamasutra.com/features/20.../hajba_pfv.htm

Well worth a good read.

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  #14  
Old 02-05-2006, 03:22 PM
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Cameraken Cameraken is offline
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Thanks Rô. I Got it.

I had googled “Photoshop High Pass”
That search found a link to gamasutra but took me to a log in page? So I gave up with that link.

Ken
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  #15  
Old 03-07-2006, 05:19 AM
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pure pure is offline
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if we use it so often, why is there no "real" combined filter for this kind of repair program, i wonder.

like one filter for diff. steps: "select > blur > highpassing"

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