Frequency is despit of our health
Frequency is a term that’s being used more and more. That’s because new tools offer you more control over frequency than ever before. Noise reduction, sharpening, and HDR all offer unprecedented control over the look and feel of detail in our images. Frequency is used to describe the amount of detail packed into a given area of an image. This is measured by the amount of tonal variation between rows or columns of pixels. Imagine measuring an image with a line that passes across it (horizontally from left to right or vertically from top to bottom). The mean or average tonal value along lines can be charted and then compared to values from other measurement lines, especially those nearest to each other.
In high frequency images you’ll find a great deal of variation between measurements; many lines, thick and/or thin, and lots of texture, coarse and/or fine, rendered with high contrast. In medium frequency images you’ll find a modest amount of variation between measurements; clear contours with moderate to low amounts of texture in between. In low frequency images you’ll find very little variation between measurements; characterized by smooth long gradations, often with reduced contrast or flat fields of color.
Many images contain a combination of high, medium, and low frequencies. When enhancing images you can choose to emphasize the dominant frequency or selectively enhance areas with different frequencies for even greater precision. Some software features provide ways to target these frequencies as you adjust them. When software doesn’t provide ways to target frequency, you can design an effect for that image area on a separate layer in Photoshop and mask it from other areas you don’t want to be treated in the same way.
In many cases, you don’t need to measure an image to decide what tack to take. By looking at an image with a discerning eye you’ll quickly be able to tell if and where an image contains high, medium, and/or low frequencies.
Simply being aware of and sensitive to frequency in images will encourage you to be more precise with your image adjustments. With a little extra care your images will all become stronger.
Category: Health, Technology
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