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  2. Free Lossless Image Format - Wikipedia

    en.wikipedia.org/wiki/Free_Lossless_Image_Format

    Free Lossless Image Format (FLIF) is a lossless image format claiming to outperform PNG, lossless WebP, lossless BPG and lossless JPEG 2000 in terms of compression ratio on a variety of inputs. [ 4 ]

  3. Image compression - Wikipedia

    en.wikipedia.org/wiki/Image_compression

    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.

  4. Guetzli - Wikipedia

    en.wikipedia.org/wiki/Guetzli

    Guetzli optimizes the quantization step of encoding to achieve compression efficiency. It constructs custom quantization tables for each file, decides on color subsampling, [4] and quantizes adjacent DCT coefficients to zero, balancing benefits in the run-length encoding of coefficients and preservation of perceived image fidelity.

  5. Image file format - Wikipedia

    en.wikipedia.org/wiki/Image_file_format

    Lossless compression should be used to avoid accumulating stages of re-compression when editing images. Lossy compression algorithms preserve a representation of the original uncompressed image that may appear to be a perfect copy, but is not a perfect copy. Often lossy compression is able to achieve smaller file sizes than lossless compression.

  6. Wikipedia : Featured picture criteria/Image size

    en.wikipedia.org/.../Image_size

    Compression of an image to reduce file size (in Kb) is usually "lossy" and is not advised for featured pictures. Image compression will reduce download times and save disk space, but it does so at the expense of fine detail and overall image quality. If in doubt, when saving JPEG files, always select the "maximum" quality setting.

  7. Deflate - Wikipedia

    en.wikipedia.org/wiki/DEFLATE

    This leads to Deflate64 having a longer compression time, and potentially a slightly higher compression ratio, than Deflate. [7] Several free and/or open source projects support Deflate64, such as 7-Zip , [ 8 ] while others, such as zlib , do not, as a result of the proprietary nature of the procedure [ 9 ] and the very modest performance ...