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EXCERPT page containing first few paragraphs. 2021-12-08 02:36:55

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.

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  • Optical quality analysis of field curvature, focus shift, sharpness, flare, distortion, and performance in the field.

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