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Localized Contrast Enhancement

Localized contrast enhancement can quickly and easily turn a dull image into one with more snap and interest.

While trivially easy to do, some judgment is needed to avoid an unnatural or harsh result.

Show below is the technique: Photoshop Filter => Sharpen => Unsharp Mask….

The settings are important: a very large 50 pixel radius, and an Amount of 5% - 10%, with 5% producing subtle improvements, and values significantly beyond 10% beginning to encroach into “too much” territory. The Amount to be used will vary by image, but 8% is a fairly safe bet for most images. To keep things simple, leaving the Radius value alone and varying the Amount makes it easier to acquire judgment on what is reasonable.

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Diglloyd DAP is DSLR-oriented, but also contains workflow and other topics. Much of the focus is on Canon and Nikon but also Pentax and Pentax medium format.

Special emphasis is placed on lens evaluation, focusing on Canon and Nikon and Sigma lenses, but with a few others like Rokinon/Samyang.

  • Make better images by learning how to get the best results right away.
  • Save money by choosing the right lens for your needs the first time, particularly some of the new Sigma Art lenses vs Nikon and Canon.
  • Workflow discusses image organization, raw conversion and post processing. Many examples show processing parameters for direct insight into how the image was converted.
  • Jaw-dropping image quality found nowhere else utilizing Retina-grade images up to 28 megapixels filling up to 5K display, plus large crops [past 2 years or so].
  • Real world examples with insights found nowhere else. Make sharper images just by understanding lens behavior you won’t read about elsewhere.
  • Aperture series from wide open through stopped down, showing the full range of lens performance and bokeh.
  • Optical quality analysis of field curvature, focus shift, sharpness, flare, distortion, and performance in the field.

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Unsharp Mask with wide radius for local contrast enhancement

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