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Action for Frequency Separation

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Old 03-06-2011, 01:31 PM
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mistermonday mistermonday is offline
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Re: Action for Frequency Separation

Originally Posted by jonathan_k View Post
Perfecto. ... and the funny thing is that I didn't even know there would be colour contained in the HF layer at all. Or that it would an issue.

Double save Murray, thanks.
A High Pass or High Freq layer consists of edges, at and below the radius you have specified, whose contrasts have been increased, and the rest of that layer is grayscale ~128/128/128. You can verify this by dragging the Saturation slider all the way to the right. The GB or LF layer has had a reduction in contrast on those same edges as the LF layer. Individually those layers appear blurred and sharpened respectively. When you mathematically add the two layers together, you get the orig image. GB+HP=Orig. Having those edges in the HF maintain color is not necessarily a bad thing depending on what you are healing / cloning. The asymetric split where there is no color in the HF layer can be beneficial but the effect is different as you will see when you play with it. There will be situations where you do not want the texture to be too prominent.

Is there any major downside to converting an image from 8-bit to 16-bit?
There is no value in converting from 8 to 16 bit, in fact it is counter-productive because the data that was there in the original 16 bit file has already been destroyed. An analogy would be as follows:
You started with two number: 62.7854 and 23.5692. You rounded off the numbers to 62 and 23. Next you decided to perform some multiplication and because you wanted a great deal of accuracy, you made the numbers 6 decimal places > 62.000000 and 23.000000. Guess what - zero x zero = zero.
When you convert an 8 bit value to 16 bit you are just doubling your file size and not adding any value. My analogy is somewhat oversimplified but you get the point.
If you have an orig 16 bit file, it is always better to work with it from beginning to end in 16 bit and then spin off an 8 bit version for print or other 8 bit output.
Regards, Murray
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Old 03-07-2011, 04:36 AM
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4personnen 4personnen is offline
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Re: Action for Frequency Separation

Be also sure that If you use the "apply image" method, to check the values of scale, offset and the blending mode which are not the same for 16 bits and 8 bits images...
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Old 03-07-2011, 03:06 PM
jonathan_k jonathan_k is offline
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Re: Action for Frequency Separation

So. I've recorded an awesome 8-bit action and its all working swimmingly. And if I want to, I could do the same for the 16-bit. Thank you all for the help. Much appreciated.
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Old 04-15-2011, 01:17 PM
Chennae Chennae is offline
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Re: Action for Frequency Separation

Probably annoying now that you've already done it, but if you look at this thread - - and read through how to use the action, it's a real time saver!
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