This tutorial describes how to convert a PNG file to JPG on the shell. I will use the command line tool GraphicsMagick for this on my Ubuntu 18.04 system, the same steps will work on Debian and probably other Linux distributions as well.
https://www.smashingmagazine.com/2018/07/converting-images-to-webp/ https://cran.r-project.org/package=magick/vignettes/intro.html http://www.libpng.org/pub/png/pngapcv.html https://linuxconfig.org/convert-image-to-grayscale-with-imagemagick https://linux.die.net/man/1/convert http://dansplumbingla.com/5dpuj/webp-converter-npm.html
https://itsfoss.com/convert-multiple-images-pdf-ubuntu-1304/ https://helpdeskgeek.com/linux-tips/convert-images-between-formats-via-the-command-line-in-ubuntu/ https://vitux.com/editing-pictures-on-linux-command-line-with-imagemagick/ https://www.xnview.com/en/xnconvert/ https://guides.wp-bullet.com/batch-resize-images-using-linux-command-line-and-imagemagick/ http://creersonsiteweb.net/page-jpg-to-png-convertir-image-format-changer-ligne-commande-ubuntu-linux https://www.systutorials.com/241682/how-to-convert-svg-to-png-in-linux/
https://www.dedoimedo.com/computers/convert-png-to-svg.html https://wiki.freepascal.org/PascalMagick https://avidemux.org/smif/index.php?topic=6035.0 https://www.researchgate.net/post/How_can_save_xmgrace_graph_ie_dos_and_band_in_jpeg_format_by_accessing_xmgrace_from_cluster https://linuxacademy.com/blog/linux/cropping-multiple-images-the-same-way-short-tutorial/
https://linoxide.com/how-tos/convert-webp-format/ http://go2linux.garron.me/linux/2011/03/convert-image-grayscale-926 http://www.gecif.net/articles/linux/images/ https://www.aconvert.com/image/ico-to-png/ https://www.instructables.com/id/Add-text-to-images-with-Linux-convert-command/ https://docs.gimp.org/2.8/en/gimp-images-out.html https://www.digitalocean.com/community/tutorials/how-to-create-and-serve-webp-images-to-speed-up-your-website
How to Convert an Image to PNG Format - howtogeek.com
