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Image compression is a type of data compression applied to digital images, to reduce their cost for storage or transmission. Algorithms may take advantage of visual perception and the statistical properties of image data to provide superior results compared with generic data compression methods which are used for other digital data.
Image scaling can be interpreted as a form of image resampling or image reconstruction from the view of the Nyquist sampling theorem.According to the theorem, downsampling to a smaller image from a higher-resolution original can only be carried out after applying a suitable 2D anti-aliasing filter to prevent aliasing artifacts.
Continuously varied JPEG compression (between Q=100 and Q=1) for an abdominal CT scan. JPEG (/ ˈ dʒ eɪ p ɛ ɡ / JAY-peg, short for Joint Photographic Experts Group and sometimes retroactively referred to as JPEG 1) [2] [3] is a commonly used method of lossy compression for digital images, particularly for those images produced by digital photography.
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Original file (636 × 636 pixels, file size: 251 KB, MIME type: image/png) This is a file from the Wikimedia Commons . Information from its description page there is shown below.
This is a quality vs speed option; however, differences are usually small between the number of neurons for a specific resize factor, however the performance difference between the count of neurons becomes larger as you quadruple the image size.
3-inch,_50_caliber_gun,_World_War_I.jpg (739 × 505 pixels, file size: 70 KB, MIME type: image/jpeg) This is a file from the Wikimedia Commons . Information from its description page there is shown below.