![]() You don’t really need to know how the whole FS process works but understanding the basics will allow you to tweak the process and achieve your own interesting effects. By adjusting the balance of these two layers, you can choose how much softening to apply in the low-pass layer and how much detail to restore in the high-pass layer. When combined, these two layers form a normal-looking image. ![]() A low frequency layer is made with the Gaussian blur filter and holds the tones and colors of your photo. It holds the sharp details of your photo. Lesson #2 – Portraiture And LandscapesĪ high frequency layer is made with the high pass filter. Now if you add time to a spatial image, you have a picture with motion, or what we call a motion picture. It is this spatial information that also describes the periodic distributions of light and dark in a photograph. Continuing this analogy, if the sound frequency is something that describes how quickly a given event happens over a certain amount of time, then it is the “spatial frequency” that describes how swiftly something changes in a certain amount of space, such as a photographic still image. If you listen to only the low frequencies, (the bass) they will have a very broad and uniform sound that changes slowly with time, while the higher frequencies will have a narrower spectrum, and will change more quickly and precisely in space and time. The low frequencies carry information about an image's colors, tonal transitions, lights, and shadows – everything you see in the image when you look at it from further away.Īs an analogy, if you imagine acoustic waves, such as music, they are composed of many different frequencies. Everything you see when you look at an image closeup. ![]() The high frequency layer in your photographs includes fine details like skin texture, hair, wrinkles, pimples, pores, or even the stitching in fabric, all of which easily shows up on today’s high-resolution cameras. High frequencies that contain fine details, like skin imperfections, hair, skin pores, grains of sand, and stone textures, whereas the low frequencies carry information about an image's colors, lights, shadows color, and tone – think sky, soft clouds, and marshmallows. Much like music that can be represented by sine waves, you can break up a photographic image into high frequency and low frequency layers. Every image can be broken into low and high frequencies. There are many frequencies in every photo, and each of these frequencies contains information based on the size of the image. Whether you’re working with RAW images or JPEGs, you can learn to utilize the power of FS to improve your photos.Ī: Combines the high and low frequency layers B: Contains no detail but all the color (low frequency layer) C: Contains no color but all the detail (high frequency layer) Lesson #1 – Basics Sure, some people will prefer the usual retouching tools and methods, including airbrushing, clone stamp tool, Gaussian blur, healing brush, and so on, but frequency separation retouching will give you another option for enhancing not only your portraits but landscapes/cityscapes and inanimate objects as well. ![]() By dividing your image into two separate layers, one layer being the high frequency information, which contains all the detail in your photograph, and the other being the low frequency layer which contains all the tonal and color information. Well you already know the answer, it’s called “frequency separation”. Let's pretend for a moment – what if the separate detail and color information of a digital image, your photograph, could be easily separated for retouching, and what if by separating these colors and details into two layers, you could work on one aspect without affecting the other or Is that even possible? And how about this – what if you could make all sorts of corrections in a portrait, for example, could you still retain the natural textures of the skin? In reality, frequency separation is the commercial retoucher’s secret weapon, and now you can learn to use it as well. Now you may think that FS is the anxiety a photographer feels when he or she is repeatedly separated from their camera gear, or better yet, maybe FS is the extreme anxiety audiophiles experience after too much time away from their stereos, but happily, for you and me, neither of these “one-liners” is true. The goal of this article is to give the reader, that’s you, a clear understanding of what frequency separation is.
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