[Solved] Unrecognized input file format --- perhaps you need -targa

In short, in case you encounter cjpeg error: Unrecognized input file format --- perhaps you need -targa, you can use the command below.

Assume that your JPG image file is source.jpg:

[root@server ~]# djpeg source.jpg | cjpeg -quality 65 -progressive -optimize -outfile source65.jpg

Rename the source file as backup, rename the optimize file to be the one to load.

[root@server ~]# mv source.jpg source.jpg.bak; mv source65.jpg source.jpg

Hope it helps someone.

Thank you.

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