downsizing several hundred png files from png24 to png8

I have several hundred images that I ended up saving as a large file format (png24) so I'd like to downsize them all. Is there a quick way to do this rather than manually opening each one in photoshop and saving as a png8?

Also, if I only have the png file and not the psd, can I still downsize the image from png24 to png8?

Thanks.开发者_StackOverflow社区

Since you already seem to have Photoshop, why not try the Actions feature? Very simple. If you have your files in one folder, you can apply the Action you recorded with one of them to all the rest.

ImageMagick is a good tool for doing batch image conversions

You can use pngquant, which supports alpha transparency and might give better color quality than Photoshop.

See other answer how to apply pngquant to entire directories.