文件名称：Portable Network Graphics (PNG) Specification (Second Edition)
文件大小：1.29MB
文件格式：PDF
更新时间：2019-04-09 10:22:03
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Portable Network Graphics (PNG) Specification (Second Edition) This document describes PNG (Portable Network Graphics), an extensible file format for the lossless, portable, well-compressed storage of raster images. PNG provides a patent-free replacement for GIF and can also replace many common uses of TIFF. Indexed-color, grayscale, and truecolor images are supported, plus an optional alpha channel. Sample depths range from 1 to 16 bits.