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DPChallenge Forums >> Photography Discussion >> Refocus sharpening (FIR Wiener filtering) in Basic
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 03/19/2008 03:52:37 AM · #1
Has anyone used this plugin with GIMP?

//refocus.sourceforge.net/

I've found it pretty nice with certain images, just wanting to make sure it's OK within the rules of Basic editing? I think it is, but any comments? :)

-H
 03/19/2008 09:16:41 AM · #2
As long as the tool applies to the entire image, I can't see any reason why it wouldn't be considered the same as USM or NI etc. However, it'd be worth you posting a few examples of what it does, so that we can see the difference.
 03/19/2008 09:45:06 AM · #3
Originally posted by Manic:
As long as the tool applies to the entire image, I can't see any reason why it wouldn't be considered the same as USM or NI etc. However, it'd be worth you posting a few examples of what it does, so that we can see the difference.

High Pass Sharpen applies to the entire image, but it's not legal in basic, is it?
 03/19/2008 10:07:14 AM · #4
High pass sharpen uses a different blending mode (overlay, soft, hard light). Even though it applies to the whole image it violates another rule about the allowed blending modes. If i'm wrong please correct me.
 03/19/2008 11:01:42 AM · #5
Originally posted by keibo84:
High pass sharpen uses a different blending mode (overlay, soft, hard light). Even though it applies to the whole image it violates another rule about the allowed blending modes. If i'm wrong please correct me.


That's correct.

R.
 03/19/2008 11:05:31 AM · #6
Originally posted by Bear_Music:
Originally posted by keibo84:
High pass sharpen uses a different blending mode (overlay, soft, hard light). Even though it applies to the whole image it violates another rule about the allowed blending modes. If i'm wrong please correct me.

That's correct.

R.

I agree, except that when you use HSM it can be applied to a normal layer and could be misleading. For many it could appear to apply to the entire image and you're not dealing with another layer (which would be illegal except for adjustment layers).
 03/19/2008 11:40:27 AM · #7
Whats the rule about blending modes? Can someone point me to it?
 03/19/2008 12:09:48 PM · #8
Basic Editing Rules

You may:

use only Adjustment Layers (or their equivalent). An Adjustment Layer is a special type of layer containing no image data that lets you experiment with color and tonal adjustments without permanently modifying the pixels. Adjustment Layers must be applied in Normal mode.
03/19/2008 12:13:05 PM · #9
Thanks :)
03/23/2008 02:05:50 PM · #10
Originally posted by Manic:
As long as the tool applies to the entire image, I can't see any reason why it wouldn't be considered the same as USM or NI etc. However, it'd be worth you posting a few examples of what it does, so that we can see the difference.


Ok! Sorry it took so long, it seems that my refocus plugin needed a patch to get it working properly... :)

Here's the original:
Here's the USM version:
Here's the refocus version:

USM is mostly ok, but in images like this, the shadows and such appear too strong, imho.

-H
 03/23/2008 02:41:23 PM · #11
I did a little research on the Weiner FIR technique, and it appears to be a deconvolution algorithm. That would make "refocus" very similar to Adobe's Smart Sharpen, or plug-ins such as Focus Magic. These are legal in Basic, and I would expect that Refocus would be no different, of course if applied to the entire image.
 03/23/2008 03:43:23 PM · #12
Originally posted by kirbic:
I did a little research on the Weiner FIR technique, and it appears to be a deconvolution algorithm. That would make "refocus" very similar to Adobe's Smart Sharpen, or plug-ins such as Focus Magic. These are legal in Basic, and I would expect that Refocus would be no different, of course if applied to the entire image.


That sounds great, thanks! :)

-H
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