by 
Editor’s note: The following review is part of Macworld’s GemFest 2013. Every day (except Sunday) from mid-July until late September, the Macworld staff will use the Mac Gems blog to briefly cover a standout free or low-cost program. Learn more about GemFest in this Macworld podcast. You can view a list of this year’s apps, updated daily, on our handy GemFest page, and you can visit the Mac Gems homepage for past Mac Gems reviews.
Over at TidBITS, we use the PNG (portable network graphics) image format exclusively for our images. Sometimes, an image can be 1MB or larger, but since discovering OptiPNG 0.7.4, I’ve been able to substantially reduce those file sizes without any noticeable degradation of image quality.
While OptiPNG is a free, open-source utility, there’s a big catch: it’s a command-line utility, and you’ll have to compile it yourself.
Here’s how to get OptiPNG up and running.
To read this article in full or to leave a comment, please click here
