I tend to use a combination on pngquant and optipng on most png based graphics. I'm sure there are builds for OSX out there (probably homebrew recipes even).
This will bring the color palette down to less than 256, some images will work better than others, in this case I didn't notice a difference and the size went from 434KB to 133KB in size using the batch file I normally use for this[1]... I haven't checked recently to see if there are newer tools/versions for use, I keep several utils inside my dropbox for windows usage.
This will bring the color palette down to less than 256, some images will work better than others, in this case I didn't notice a difference and the size went from 434KB to 133KB in size using the batch file I normally use for this[1]... I haven't checked recently to see if there are newer tools/versions for use, I keep several utils inside my dropbox for windows usage.
[1] https://gist.github.com/tracker1/e41d6b7dc55f962d85a3