Image files often contain some unnecessary information (such as comments, EXIF tags, color profile, etc.). The image quality does not have any change after removing them, yet this can achieve the purpose of 'weight loss' to image file. And finally that will improve the image loading speed and take up less disk storage space.
If you are a webmaster or graphic designer working on Mac OS, then you've probably heard of ImageOptim. It is a simply designed image size optimization/compression app, and its essence is an integrated front-end (i.e. GUI) of variety of classic and excellent image optimization tools (AdvPNG, OptiPNG, PNGCrush, JpegOptim, Jpegtran, Gifsicle, AdvanceComp and PNGOUT) on Windows and Linux.
In the field of web design/front-end development (on Mac), ImageOptim is absolutely the essential image compressor & optimizer. It just makes the image processing as easy as turning your hand for the most commonly used image formats (PNG, JPEP, GIF, etc.). In addition, ImageOptim also provides Workflow to enable you to perform rapid image processing in the Finder's context menu.
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