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iPhone 6s Plus: Sharpening and Downsampling

See the general commentary on iPhone 6s Plus performance.

iPhone 6s Plus per-pixel quality (still or panorama) is of a low order, such that a 1.5X to 2X linear reduction is required for what a 35mm full-frame conventional camera can do in one pixel, that is: 4 pixels becoming one pixel (2X reduction) e.g., an 8 megapixel image frequently really only has 2 megapixels of useful detail as compared to a very high quality In the best case this rises to no more than 5 megapixels, and that’s a stretch unless one has low quality standards and an untrained eye for good pixel quality. Which of course would draw a blank stare from most iPhone users!

This page discusses a process for sharpening and downsampling iPhone 6s Plus panoramas. This process relies on the fact that panoramas have many more pixels than still photo images. Examining many field images, it is clear that iPhone 6s Plus panoramas at full resolution have nothing to offer over 1.5X to 2X linear reductions. The downsampling process improves per-pixel quality substantially to very good levels, and loses no sharpness.

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Diglloyd Guide to Mirrorless offers comprehensive integrated coverage of most APS-C and full frame mirrorless cameras and lenses.

Special emphasis is placed on Sony full-frame, including Sony lenses and the high performance Zeiss Batis and Zeiss Loxia lenses plus Rokinon/Samyang and others. Fujifilm X, Olympus and Panasonic M4/3, Sigma dp Merrill and dp/sd Quattro are also covered in depth. Years in the making, it offers a wealth of material for choosing and using a mirrorless camera.

  • Make better images by learning how to get the best results right away. For example, the best way to set up your Sony camera.
  • Save money by choosing the right lens for your needs the first time, particularly with the numerous lenses available for Sony.
  • Make better images, a sort of “cheat sheet” saving yourself months or years of ad-hoc learning—best practices and how-to and processing parameters are discussed and shown.
  • Jaw-dropping image quality found nowhere else utilizing Retina-grade images up to full camera resolution, plus large crops.
  • 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.

Want a preview? Click on any page below to see an excerpt as well as extensive blog coverage, for example on Sony.

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