https://www.skillshare.com/classes/JPG-to-PNG-Image-Background-Removal-Made-Easy/503881503
Hello, welcome to the class! In this class you will learn how to turn any JPG image into a PNG image or in other words, you will learn how to remove the background of an image. This class will show you how to remove the background of an image using a feature that is free and is built into any Apple computer or laptop, called “Preview”. Using this tool will allow you to remove the background from images quickly and easily.

JPG Compress is used to compress jpeg files. Program supports lossless optimization, which is based on optimizing the Huffman tables. And so called "lossy" optimization where in addition to optimizing Huffman tables user can specify upper limit for JPG quality.