Underneath the already known

This should work in any UNIX distribution having libtiff and imagemagick installed.
My friend gave me a pack of high-res scanned images, almost 300 Mb in size.
I wanted to make them smaller and to combine them into one pdf.

That’s what I came up with (after some research):

$ find . -name "*.JPG" -exec convert -format TIFF -resize 33% -quality 100 {} {}.TIFF \;
$ tiffcp *.TIFF big.TIFF
$ tiff2pdf -o big.pdf big.TIFF