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Original file (7,680 × 4,320 pixels, file size: 253 KB, MIME type: image/png) This is a file from the Wikimedia Commons . Information from its description page there is shown below.
For example, graphically simple images (i.e. images with large continuous regions like line art or animation sequences) may be losslessly compressed into a GIF or PNG format and result in a smaller file size than a lossy JPEG format. For example, a 640 × 480 pixel image with 24-bit color would occupy almost a megabyte of space:
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Windows Vista added full support for 256×256-pixel 32-bit color icons, [Notes 1] as well as support for the compressed PNG format. Although compression is not required, Microsoft recommends that all 32-bit color 256×256 icons in ICO files should be stored in PNG format to reduce the overall size of the file. The Windows Vista Explorer ...
The Apple Icon Image format (.icns) is an icon format used in Apple Inc.'s macOS.It supports icons of 16 × 16, 32 × 32, 48 × 48, 128 × 128, 256 × 256, 512 × 512 points at 1x and 2x scale, with both 1-and 8-bit alpha channels and multiple image states (example: open and closed folders).
Wikipedia's favicon, shown in Firefox. A favicon (/ ˈ f æ v. ɪ ˌ k ɒ n /; short for favorite icon), also known as a shortcut icon, website icon, tab icon, URL icon, or bookmark icon, is a file containing one or more small icons [1] associated with a particular website or web page.
Google reports a 64% reduction in file size for images converted from animated GIFs to lossy WebP, however, with a very noticeable visual impact, both at default settings, and optimised settings. When converting using lossless WebP, a 19% reduction is achieved as reported by Google, [ 28 ] although real world performance is nearer to 10%.
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