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1. Background 1.1 The PNG file format The Portable Network Graphics (PNG) is a format for storing compressed raster graphics. The compression engine is based on the Deflate method [RFC1951], designed by PKWare and originally used in PKZIP. The PNG format is defined by the PNG Specification. This specification was developed by an ad-hoc group named the PNG Development Group, and it is both an Inter
optiPNG is a PNG optimizer that recompresses image files to a smaller size, without losing any information. This program also converts external formats (BMP, GIF, PNM and TIFF) to optimized PNG, and performs PNG integrity checks and corrections. If you wish to learn how PNG optimization works, or to know about other similar tools, see the PNG Tech article A guide to PNG optimization. DOWNLOAD opti
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