How to compress you images losslessly as PNGs
Posted: Sun Sep 03, 2006 8:55 am
sorry, I've been off to a conference for a few days
How to reduce the file size of pngs? If you feel you are very computer unsavvy you should probably open your tiffs and gifs in preview and then choose "Save as…" under the file menu – in the following dialog you have the option to save them as pngs. However, at that point they won't be as optimized as they can be. To further optimize their size you can download an app called PNGcrusher.
However, I use GraphicConverter to convert my images to different formats. It has some great batch functions. Although GraphicConverter is great, it does not compress pngs as well as the optipng algorithm does. PNGcrusher uses the optipng algorithm, but I find its user interface lacking and prefer to use the latest optipng version on the command line. You can find two sources for optipng:
http://pornel.net/optipngosx (this is a precompiled binary of v. 0.5.2 which you have to put into some /bin folder)
http://optipng.darwinports.com/ (this is for installation using the darwinports installer)
and here you can get the optipng sourcecode:
http://optipng.sourceforge.net/
How to reduce the file size of pngs? If you feel you are very computer unsavvy you should probably open your tiffs and gifs in preview and then choose "Save as…" under the file menu – in the following dialog you have the option to save them as pngs. However, at that point they won't be as optimized as they can be. To further optimize their size you can download an app called PNGcrusher.
However, I use GraphicConverter to convert my images to different formats. It has some great batch functions. Although GraphicConverter is great, it does not compress pngs as well as the optipng algorithm does. PNGcrusher uses the optipng algorithm, but I find its user interface lacking and prefer to use the latest optipng version on the command line. You can find two sources for optipng:
http://pornel.net/optipngosx (this is a precompiled binary of v. 0.5.2 which you have to put into some /bin folder)
http://optipng.darwinports.com/ (this is for installation using the darwinports installer)
and here you can get the optipng sourcecode:
http://optipng.sourceforge.net/