The best opening paragraph for a D3 zoom article has already been written, and it goes like this: Peter Kerpedijec on Empty Pipes (see sources below) The appearance of poor quality in photographs can be intentionally used to imply carelessness on the part of the photographer and a sense of candidness in the photograph.By lars verspohl D3 Zoom: The Missing Manual How to zoom and pan in your data visualizations using SVG and Canvas ‘ Telescope Zoom Lens Patent From 1999 - Blueprint’ by Aged Pixel Photographers can purposefully employ digital zoom for the characteristic low-fidelity appearance of the images it produces. There are also cameras with digital zoom functions as high as 7.2× and Smart Zoom with approximately 30× total zoom (optical zoom 20× and digital zoom 1.5×) for 7MP from 16MP total resolution, and also 144× total zoom (optical zoom 20× and digital zoom 7.2×) for VGA 640x480. The terms among camera and image sensor manufacturers are "Smart Zoom" ( Sony), "Safe Zoom" ( Canon), "Sensor Crop" ( Cisco) and "Intelligent Zoom" ( Panasonic and others). ![]() This means that, for example, if implemented correctly by the camera hardware and software, a 2160p image sensor would enable up to 2× lossless digital zoom for 1080p video recording, 3× for 720p video, and 4.5× for 480p video by using image sensor cropping. ![]() Many cameras, including mobile phone cameras, also employ lossless digital zoom for video recording by using the spare resolution of the image sensor for cropping by taking advantage of used video frame resolutions often being significantly below the available resolution of the image sensors. Trying to zoom in further than this limit may result in loss of quality as the camera switches to digital zoom, though hybrid zoom may mitigate this. Smartphones with optical zoom have lenses with 3× or 5× magnification. Hybrid zoom is a concept used in smartphones that takes advantage of optical zoom, digital zoom, and software to get improved results when zooming in further than the lens’ physical capabilities. The intelligent zoom only uses the centre of the image sensor and does not interpolate the original resolution, so the resulting image quality is good in reduced resolution. Many cameras have 2 options: 1.4× and 2.0×. Ĭameras may have an intelligent zoom feature that allows an additional magnification of 2.0× on top of its optical zoom. The benefits are reduced file sizes and the ability to calculate the zoom level from the image's dimensions, if not included in its meta data. Some camera firmwares store lossily digitally zoomed images with accordingly reduced dimensions (width and height) rather than upscaling it to the original raster resolution. Magnification in deteriorated digital zoom zone is 72×: 10 = 7.2×, the bigger the number, the worse the image Zoom 72×, Optical zoom 10× and Digital zoom 7.2× taken in full resolution 16 MP, but resize to 2 MP for uploading, ISO 800, 1/680, F/14.0, more noise, but the detail is more clear. Professional cameras generally do not feature digital zoom. Full-sized cameras generally have an optical zoom lens, but some apply digital zoom automatically once the longest optical focal length possible has been reached. ![]() Lower-end camera phones use only digital zoom and do not have optical zoom, while many higher-end phones have additional rear cameras, including fixed telephoto lenses that allow for the simulation of optical zoom. In cameras that save in a lossless format, resizing in post-production yields results equal or superior to digital zoom. In cameras that perform lossy compression, digital zoom is preferred to enlargement in post-processing, as the zooming may be applied before detail is lost to compression. Digital zooming may be enhanced by computationally expensive algorithms which sometimes involves artificial intelligence. It is accomplished electronically, so no optical resolution is gained. It is accomplished by cropping an image down to an area with the same aspect ratio as the original, and scaling the image up to the dimensions of the original. ![]() Typically, the digital zoom is not available until the optical zoom has been exhausted.ĭigital zoom is a method of decreasing the precise angle of view of a digital photograph or video image. No quality is lost however, with the lens zoomed-in optically for the bottom photo. Digital zoom has been used to create the middle photo from within the top photo.
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