The Photography Knowledge Hub Blog

About Photography Color Correction and Pre-press

Frequency Separation Made Easy

To put it as easily as possible, frequency separation is a Photoshop technique which separates the texture of an image from its shape creating two layers, one storing color and luminosity information and the other one, storing the detail. Activating a curve adjustment layer, restricted to operate on the high frequency layer, you can change the detail level of the image by steepening or flattening the curve. You will also be able to easily clone over defective parts with no visible side-effects.

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What’s new in Wow! Frequency Equalizer Pro Vs Classic

Wow! Classic works on five different frequency layers, but where are they? Well, they’re hidden: you actually manipulate them with the sliders, but there’s nothing else you can do. Wow! Pro adds the option to turn each frequency into its own pixel layers. You can paint, clone and heal on the very exact frequency layer that contains the features you need to target, with great precision, giving you unprecedented control over the retouching process.

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Spatial Frequency Separation in Theory

Usually one encounters spatial frequency separation for the first time in the field of beauty retouch. To put it as easily as possible, it is a technique which separates the texture of an image from its shape, allowing the retoucher to easily clone over defective parts with no visible side-effects.

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VitaminBW: a Steady Path to Black-and-White

Black-and-white is pleasure and pain for any photographer – even those who don’t actually use it. About six months ago I stumbled into an interesting technique to convert a color image to B&W and wrote an article about it: it was Gorman-Holbert’s method. Such article spawned two more, one of which further expanded this technique.

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ALCE and 360° panoramic images

Two suggestion for ALCE processing of equirectangular images to be used building 360 degree panoramas. By Davide BarrancaEquirectangular images, the ones used to build those beautiful, immersive, 360 degrees panoramas, may require some extra attention with ALCE , in...

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In-a-Gamma-da-Vida

A false profile (that is, a profile with a non-standard gamma value) can be expressed as pencil-drawn curves generated by Photoshop. While this has little practical relevance, it allows us to understand what assigning a false profile actually does to an image by simply inspecting the shape of a curve.

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Dan Margulis on Italy and RBG

The truth is that it is a land of love and great beauty, made all the more beautiful professionally by seeing the new and sophisticated imaging algorithms being developed by Davide with Marco Olivotto, and by seeing how Alessandro, Daniele Di Stanio, Tiziano Fruet and others have brought first-class color instruction into a country where it was rarely found previously.

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Larry Lourcey on ALCE: New Way To Enhance Contrast

ALCE2 is a deceptively easy tool that enhances the contrast of an image to really give it some punch. Unlike some filters that have hundreds of options and boxes to click – this one is simple: just one slider. You dial in the amount of effect you want and off it goes. Best of all, it records the setting you used – right in the layer name – so you can actually recreate the look later. This was a huge plus for me!

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