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The main use of pngcrush is for reducing the size of the image data contained in the IDAT section. The pixel data in a PNG file is compressed using LZ77 algorithm (which tries to find repeated byte sequences in the source data), and then further compressed with Huffman algorithm. This combination is referred to as deflate compression. Before ...
Original file (SVG file, nominally 256 × 256 pixels, file size: 1 KB) This is a file from the Wikimedia Commons . Information from its description page there is shown below.
Size of this PNG preview of this SVG file: ... nominally 512 × 512 pixels, file size: 663 bytes) ... Facebook icon in a black circle. Icon used.
PNGOUT is a freeware command line optimizer for PNG images written by Ken Silverman. The transformation is lossless, meaning that the resulting image is visually identical to the source image. According to its author, this program can often get higher compression than other optimizers by 5–10%. [3]
This image or media file may be available on the Wikimedia Commons as File:Facebook f logo (2021).svg, where categories and captions may be viewed. While the license of this file may be compliant with the Wikimedia Commons, an editor has requested that the local copy be kept too.
The following other wikis use this file: Usage on ca.wikipedia.org Viquipèdia:Innocentades; Usage on ckb.wikipedia.org دوگمەی ڵایکی فەیسبووک
Original file (SVG file, nominally 512 × 512 pixels, file size: 889 bytes) This is a file from the Wikimedia Commons . Information from its description page there is shown below.
TIFF also supports the compression algorithm PNG uses (i.e. Compression Tag 0008 16 'Adobe-style') with medium usage and support by applications. TIFF also offers special-purpose lossless compression algorithms like CCITT Group IV, which can compress bilevel images (e.g., faxes or black-and-white text) better than PNG's compression algorithm.