1. jpegtran : copy the EXE to somewhere in your system path (a tools or Windows folder even)
2. ImageMagick: I installed the x64 16-bit DLL version & added it to my system path.
3. Batch file called "jpeg.bat" I put where I saved jpegtran...
FOR /R . %%G IN (*.jpg) DO jpegtran -optimize -copy all %%G %%G4. Use "cmd" in Start-Run or Windows-R: "cd" to where your pictures are saved, and run "jpeg". Go do something else while you wait.
FOR /R . %%G IN (*.jpg) DO convert -auto-orient -quality 85 %%G %%G
FOR /R . %%G IN (*.jpg) DO jpegtran -optimize -progressive -copy all %%G %%G
Additional References
* Tutorial on changing your system path (if you need it)
* JPEG on Wikipedia
* "FOR /R" reference
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