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libjpeg is only used by ConvertType to read from and write to JPEG images. libjpeg is a very basic library that provides tools to read and write JPEG images, most of the GNU/Linux graphic programs and libraries use it. Therefore you most probably already have it installed. libjpeg-turbo is an alternative to libjpeg. It uses SIMD instructions for ARM based systems that significantly decreases the processing time of JPEG compression and decompression algorithms.
Read in other formats.
GNU Astronomy Utilities manual, November 2015.