To create a single thumbnail
convert -define jpeg:size=500x180 Zstructures0378.jpg -auto-orient -thumbnail 250x90 -unsharp 0x.5 thumbnail.gif
To make a directory listing:
$ for i in `ls`; do echo $i|sed 's/.*/&<\/a>/'; done
To make a bunch of thumbs for all files in dir:
$ for i in `ls`; do convert -define jpeg:size=500x180 $i -auto-orient -thumbnail 250x90 -unsharp 0x.5 t_$i; done
Make a list of thumbnails:
$ for i in `ls t_*`; do echo $i|sed 's/.*/&<\/a>/'; done>thumblist.htm
Make a contact sheet from list of thumbnails:
$ sed 's/=t_/=/;s/t_.*jpg//' thumblist.htm >thumbpix.html
results at
http://cs.sru.edu/~ddailey/P/T/thumbpix.html