img2pdf binary package in Ubuntu Xenial amd64

 This program will take a list of raster images and produce a PDF file with the
 images embedded in it. JPEG and JPEG2000 images will be included without
 recompression. Raster images in other formats will be included with zip/flate
 encoding which usually leads to an increase in the resulting size because
 formats like png compress better than PDF which just zip/flate compresses the
 RGB data. As a result, this tool is able to losslessly wrap images into a PDF
 container with a quality to filesize ratio that is typically better (in case
 of JPEG and JPEG2000 images) or equal (in case of other formats) than that of
 existing tools.

Source package