High pass filter?

Comments and discussions about 8bf plugins which can be use in various applications like Photoshop, Paint Shop Pro or Photo-Paint
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golloween
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Joined: Fri Apr 04, 2003 10:37 am

Post by golloween »

Doug,

Actually, you don't need a filter to do high pass. All you need is Gaussian Blur and Invert:

1. Copy the original layer into a separate layer
2. Place the copy layer over the original
3. Blur the copy layer using Gaussian Blur
4. Invert the copy layer
5. Set the transparency of the copy layer to 50%

Voila!

HaraldHeim
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Post by HaraldHeim »

Interesting. But you get a more accurate Highpass effect if you additionally use the Linear Light blend mode in Photoshop. That blend mode isn't available in PSP, but the Normal blend mode will do, too.

Can you please share the URL about the lithographic derivation, Doug?

Guest

Post by Guest »

There is also an excellent article about the High Pass on Gamasutra:
http://www.gamasutra.com/features/20010523/hajba_01.htm

Guest

Post by Guest »

Paint Shop Pro 8 has a 5x5 Highpass and a Highpass plugin listed under the User defined plugin listing.

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