Whether you’re creating a website, publishing an online photo gallery, or you just want to share your favorite pictures on a social network, the need to compress high-quality images is critical. Any image that has a smaller size will load on a web page faster, fit into an email message more easily, and transfer across the Internet more quickly. Compressed images can speed up the entire page load time of your site, and that’s really important when you’re looking to design a high quality web page that people aren’t annoyed to visit because the images take so long to load!...
Read the full article: Finding the Best PNG Image Compression Tool
Image compression works by reducing the amount of visible information. So whereas the original picture might be able to display 65 million colors, since the eye can not differentiate between anywhere near this number of colors the software is going through and removing colors that are not needed. The actual complexity of the algorithms is far more complex than that, and beyond the scope of this response. But the threshold (assuming I understand your context correctly) has to do with how the algorithm decides what information to throw away and what information to keep, and thus will affect the resulting quality and size of the image after compressions. By the way to use this free Image Compression Tool
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