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== [[XnView]] ==This is far more than a image viewing software, and would not be considered lightweight. However, it is extremely useful and highly recommended to have installed along with your favorite basic image viewing software. [[XnView]] can open most any existing image format and export it to most any existing image format. For example, if you need to open a legacy [[Paint Shop Pro]] image file ( PSP File ) and found the PSP Plugin for [[GIMP]] does not work, you can use XnView. the XnView application is not (as of 2019) currently in the Ubuntu or Mint repository but can be easily installed from a deb package.