[@Peter Blaise] Thank you for your feedback. As for the raw – you nailed it, we write it as a file format, which is certainly not right.
Optimize option in Coolutils Total Image Converter takes JPEG, PNG and GIF images and makes copies smaller in size trying to keep the visual quality. It’s all about file size, which is crucial for fast page upload. This option is loved by webmasters, who have hundreds of images and want to compress them all in one go.
As for command line – you can make all the settings in GUI and the app will create a BAT file in one click. Use the button on the last inlay of the wizard http://my.jetscreenshot.com/12042/20181126-ql7t-253kb