PNG或便携式网络图形格式是一种使用无损压缩算法存储光栅图像的图形文件格式。它使用两个阶段的压缩方法。它经常用作网站图像，而不是打印，因为它只支持RGB颜色模型。所以CMYK彩色图像不能保存为PNG图像。
PNG or Portable Network Graphic format is a graphic file format that uses lossless compression algorithm to store raster images. It uses 2 stage compression methods. It is frequently used as web site images rather than printing as it supports only the RGB color model. So CMYK color images cannot be saved as PNG image.
