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Could someone please clarify "inverted high pass"

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Old 01-13-2011, 06:01 AM
fraiseap fraiseap is offline
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Could someone please clarify "inverted high pass"

Sorry to ask such a simple question but I have tried to find the answer and have just got more confused.

Many of the pro retouchers talk about using inverted high pass as well as cloning, healing, D&B etc.

Are people referring to inverting a high pass layer as part of a frequency separation technique or is it being used to blur/smoothen the image (or something else).

Could someone please explain the main steps involved and where the IHP comes in the workflow.

Thanks
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Old 01-13-2011, 06:20 AM
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Der_W Der_W is offline
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Re: Could someone please clarify "inverted high pa

One explanation can be found here: http://retouchpro.com/tutorials/?m=show&id=213

The frequency separation is a way to make the high pass used more accurate, so instead of using the native high pass, you'd use either the Apply Image high pass or a workaround where you halve the contrast of the layer before you apply the high pass to it.
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Old 01-13-2011, 07:27 AM
fraiseap fraiseap is offline
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Re: Could someone please clarify "inverted high pa

Thanks Jonas,

I have read this tutorial before and have used this technique. So when people say they use IHP (as in "I use clone+D&B+IHP") are they referring to the "quick degrunge technique?
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Old 01-13-2011, 07:39 AM
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mistermonday mistermonday is offline
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Re: Could someone please clarify "inverted high pa

fraiseap, yes, the inverted IHP is the Degrunge technique which basically isolates and blurs edges of an image whose radii fall within a range speciifed by your GB and HP. The high pass can be executed either with the Filter>Other>High Pass or with the Accurate High Pass using Apply Image.
Regards, Murray
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Old 01-13-2011, 09:33 AM
fraiseap fraiseap is offline
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Re: Could someone please clarify "inverted high pa

Thanks Murray,

all is now clear

Adam
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