ImageMagick: Lossless max compression for PNG?

Question

I\'d like to achieve a maximum amount of compression when saving to a lossless PNG using ImageMagick. I\'m doing batch conversion of many PSDs.

I tried a few things,

Answer 1

The best compression I got was as follows:

convert wallpsw.png -resize 1024x768 -quality 95 \
                    -depth 8 wallpsw-q95-r1024x768-d8.png

The results:

identify wallpsw*

 wallpsw.png PNG 1920x1080 1920x1080+0+0 16-bit DirectClass 4.63MB 0.000u 0:00.000
 wallpsw-q95-r1024x768-d8.png[1] PNG 1024x576 1024x576+0+0 8-bit DirectClass 854KB 0.000u 0:00.000

If anyone knows a better way, tell me please. I could not find.