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An image size can be changed in several ways. Consider resizing a 160x160 pixel photo to the following 40x40 pixel thumbnail and then scaling the thumbnail to a 160x160 pixel image. Also consider doubling the size of the following image containing text.
Original file (1,275 × 1,650 pixels, file size: 8.78 MB, MIME type: application/pdf, 36 pages) This is a file from the Wikimedia Commons . Information from its description page there is shown below.
Like any resampling operation, changing image size and bit depth are lossy in all cases of downsampling, such as 30-bit to 24-bit or 24-bit to 8-bit palette-based images. While increasing bit depth is usually lossless, increasing image size can introduce aliasing or other undesired artifacts.
File Explorer (Preview Panes) adds SVG, Markdown and PDF previews to File Explorer. [27] File Locksmith adds the ability to check which files are in use and by which processes. [28] Host File Editor adds the ability to edit the 'Hosts' file in a convenient way. [28] Image Resizer adds a context menu to File Explorer for resizing images. [29]
Thus, a representation that compresses the storage size of a file from 10 MB to 2 MB yields a space saving of 1 - 2/10 = 0.8, often notated as a percentage, 80%. For signals of indefinite size, such as streaming audio and video, the compression ratio is defined in terms of uncompressed and compressed data rates instead of data sizes:
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. The image is ...
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