Just came across this little site for shrinking PNG sizes. I was a little worried about it as it's a lossy compression method but it looses unused colour channels and meta data, which was fine by me. I had great results on some files 85%+ compression.
Here's the site...
http://tinypng.org/
Another option (if you run Windows) would be to use ScriptPNG (http://"http://css-ig.net/scriptpng").
There are also some other image optimization scripts there: http://css-ig.net/tools/ (http://css-ig.net/tools/)
RIOT uses OptiPNG engine (so is nice as a GUI too) for the optimisation but RIOT also does GIF and JPEG also.
http://download.criosweb.ro/download.php?sid=R (http://download.criosweb.ro/download.php?sid=R) <<--- Link to Portable USB version ;)
Some great tools here. Cheers :)
Before "discovering" ScriptPNG & co, I did use RIOT. It gives good results but there are some things it does that are pretty annoying (for a web designer at least), mainly that it doesn't respect any kind of transparency when transforming to PNG8.
Quote from: Ruidesco on 2012-Oct-26
Before "discovering" ScriptPNG & co, I did use RIOT. It gives good results but there are some things it does that are pretty annoying (for a web designer at least), mainly that it doesn't respect any kind of transparency when transforming to PNG8.
You have a dropdown now where you can choose one of the external PNG optimisers so it'll probably remedy the 24bit --> 8bit alpha not being rendered.
Yeah I know; I mean, I was using it until a month ago or so. None of the three worked with simple GIF-like transparency, much less partial transparencies in PNG8 images.
Didn't realise you had tried it so recently. Here's another PNG optimising download to add to the mix :)
http://pnggauntlet.com/ (http://pnggauntlet.com/)
Quote from: Ruidesco on 2012-Oct-26
Yeah I know; I mean, I was using it until a month ago or so. None of the three worked with simple GIF-like transparency, much less partial transparencies in PNG8 images.
http://tinypng.org handles 24 bit to 8 bit+transparency well BTW.