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what frequencies are?

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  #1  
Old 11-22-2009, 10:41 AM
Isedo Isedo is offline
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what frequencies are?

Hi all, i'm starting to hear a lor about frequencies but I really can't understand practically what we are talking about.

I saw in the Chris Tarantino webinar he has some curves present regarding high and low freq.

Please can someone explain in a practical way how to use them and what they are? Thanks
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Old 11-22-2009, 11:12 AM
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Godmother Godmother is offline
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Re: what frequencies are?

Quote:
Originally Posted by Isedo View Post
Hi all, i'm starting to hear a lor about frequencies but I really can't understand practically what we are talking about.

I saw in the Chris Tarantino webinar he has some curves present regarding high and low freq.

Please can someone explain in a practical way how to use them and what they are? Thanks
Very long explanatory thread in Model Mayhem
http://www.modelmayhem.com/po.php?thread_id=439098

Debate and some easier explanation here
http://www.modelmayhem.com/po.php?thread_id=527633
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Old 11-22-2009, 11:21 AM
Isedo Isedo is offline
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Re: what frequencies are?

Yes, i red that thread but really did not understood it...
Can u please show some practical exemple?
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Old 11-22-2009, 01:00 PM
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Godmother Godmother is offline
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Re: what frequencies are?

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Originally Posted by Isedo View Post
Yes, i red that thread but really did not understood it...
Can u please show some practical exemple?
There's a lot of practical samples on that same thread. I'm against spoon feeding.

Read it all.

x
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Old 11-22-2009, 01:37 PM
Isedo Isedo is offline
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Re: what frequencies are?

I have red it. All that regarding the sharpening is ok, no problem for me. But that thread does not explains what frequencies are....not for me...I mean in practical way...high pass is high frequency and blur is the low one?

Last edited by Isedo; 11-22-2009 at 01:43 PM.
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Old 11-22-2009, 02:29 PM
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gamedonechanged gamedonechanged is offline
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Re: what frequencies are?

There are plenty of examples in that thread but you only really need to read the 1st page and then from page 12 onwards.

All you need to take from that thread is that you can separate your image into 2 frequencies, 1 high which is the texture and 1 low which holds the tone. From that you can do a better job of cleaning up the imagine before you do some d&b.
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Old 11-22-2009, 03:43 PM
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gene_spark gene_spark is offline
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Re: what frequencies are?

Ist very easy, fine details like Hair are hight ferquencies, big things may be like Clouds in the sky are low fequencies.
In Cameras a low Pass Filter is used,....ist a better name for a blur....:-))


lg.

Last edited by gene_spark; 11-22-2009 at 03:57 PM.
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Old 11-22-2009, 11:10 PM
Quantum3 Quantum3 is offline
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Re: what frequencies are?

You have to have the experience, then you will understand the meaning. It's like in music and equalizators. You can increase/decrease the frecuencies. I'm personally wondering how to handle the other frecuencies of the spectre, the same than in music you have several frecuencies and you can edit all of them, in image is the same but wondering how to do that. If anybody can answer this, go ahead
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Old 11-23-2009, 02:19 AM
Isedo Isedo is offline
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Re: what frequencies are?

THanks so much for replies. The answer of gamedonechanged and gene_spark, in particular way, are exactly what I was looking for. Thanks so much.

Reading the Quantum3 answer I agree that is very interesting to understand that point.
In my post processing workflow I'm always using frequencies but I never knew they are called like that. I don't want to do a duplicate of the modelMayhem thread here but...this is another forum, with another people, so if you agree, we can continue this argument also here. What do you think about?
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Old 11-23-2009, 05:39 AM
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Re: what frequencies are?

@ Quamtum3
years ago Nik had a tool an they called it ...Equalizer.
With unmask sharpening and blurring you can handel the freqencies with the radius setting..and the strenghts with the amount...if thats not enough you can Mask or use the Blend-if Slider, or you you use The Curve. All Image adjustments in Photoshop are to manipulate Frequencies from different perspectives.
@ Isedo
but i think that this topik is too technikal for me. I´m looking at a Picture and then i changed what distracts me. In Beauty retouching i think oh, these Pores are to heavy so i damped ist with D/B and thats all. Im not thinking in frequencies im not in signalprocessing with Mathematica or Math-Lab, i do retouching with Photoshop.
May be the Dan Margulis " Applied Color Theory Group" is a Yahoo Group you are interested in. There, the topic of Image manipulation was discussed on a very high and also praktical Level.
lg.
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