This is a late response to your question, but in my experience, all of the options you cite will usually work only if the colors of your source image can comfortably fit within a range of 256 colors. Images that are primarily solid colors or have very complex patterns where dithering isn't apparent are good candidates for reducing to 8 bit. Photographic images with wide ranges of color will often display visual artifacts when their color is reduced to 8 bits, so the end result is not better than the original.
FWIW, if you're working on OS X, you might consider ImageOptim (http://imageoptim.com/) to optimize your PNG images. It's an open source collection of tools combined to batch optimize PNGs, and claims to reduce images to PNG8 + alpha (same as the sites you mention) when possible. Whether it's the best or not, I can't say, but I've noted substantial file size savings using it. It's slow with large images, so you'll have to decide if the space saving is worthwhile in those cases. Regards, Scott Rossi Creative Director Tactile Media, UX/UI Design On 8/5/13 8:51 PM, "Alejandro Tejada" <capellan2...@gmail.com> wrote: >Hi all, > >Recently, I was testing the efficiency of different >bitmap image optimization methods and found >these webpages that optimize PNG files: > >http://www.8bitalpha.com/ >http://tinypng.org/ >http://compresspng.com/ > >24 bit Transparent PNG files reduced to 8 bit >look better and are much more smaller. > >Could you test if this is true in your own computer? >How many of you optimize all images used in your >own stacks and applications? > >You could use this image: >http://upload.wikimedia.org/wikipedia/commons/b/bc/Gluecksklee_(transparen >t_background).png > >Thanks in advance! > >Al > >P.D. >These are similar webpages: >http://jpeg-optimizer.com/ >http://compressjpg.com/ >http://media4x.com/jpeg-minimizer/ >http://www.jpegreducer.com/ >http://www.gifreducer.com/ >http://tools.dynamicdrive.com/imageoptimizer/ >http://webresizer.com/resizer/ >https://kraken.io/web-interface > > > > > > > >-- >View this message in context: >http://runtime-revolution.278305.n4.nabble.com/PNG-Image-Optimization-tp46 >68374.html >Sent from the Revolution - User mailing list archive at Nabble.com. > >_______________________________________________ >use-livecode mailing list >use-livecode@lists.runrev.com >Please visit this url to subscribe, unsubscribe and manage your >subscription preferences: >http://lists.runrev.com/mailman/listinfo/use-livecode > _______________________________________________ use-livecode mailing list use-livecode@lists.runrev.com Please visit this url to subscribe, unsubscribe and manage your subscription preferences: http://lists.runrev.com/mailman/listinfo/use-livecode
