jpeg使用说明 - 源码 - 源码 - 免费下载

jpeg使用说明

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资源说明：If native is FALSE then an array of the dimensions height x width x channels. If there is only one channel the result is a matrix. The values are reals between 0 and 1. If native is TRUE then an object of the class nativeRaster is returned instead. The latter cannot be easily computed on but is the most efficient way to draw using rasterImage. Most common files decompress into RGB (3 channels) or Grayscale (1 channel). Note that Grayscale images cannot be directly used in rasterImage unless native is set to TRUE because rasterImage requires RGB or RGBA format (nativeRaster is always 8-bit RGBA). JPEG doesn’t support alpha channel, you may want to use PNG instead in such situations.

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