gm 下载与jpg png转换方式请参考: https://www.cnblogs.com/hapday/p/9220865.html
gm dng格式图片转jpg出现***错误***:
linux 需安装dcraw
**yum install dcraw**
来源:CSDN
作者:爱我你会火_
链接:https://blog.csdn.net/yuzhiqiang_1/article/details/103861610