In general, compressing files in modern operating systems is a complex technique to learn.

By default NXPowerLite doesn't change the image resolution, so you can be comfortable that images will still look great when printed.If you have lots of large files or folders on your Mac, it is wise to compress them in order to get more free space, for compressed files take up less space on your Mac's hard disk than uncompressed files. Image resolution is the main factor when considering how images will print - if the resolution is too low then it negatively affects the print quality. If you analyze the uncompressed and compressed images with a computer using a threshold algorithm, you can see minor differences - but by eye, they look identical. This lossy compression approach does create slight pixel differences in the before and after file. This can substantially reduce the file size without reducing the image resolution and without changing the perceptual quality of the image. It decodes and re-encode JPEGs using more efficient settings. NXPowerLite can reduce the file size of your JPEG photos by more than 50% without resizing them. NXPowerLite uses a number of techniques to reduce the amount of data in JPEG files, resulting in impressive size reduction without discernible loss of quality. Most of this information is not visually detectable and unnecessarily increases the size of the file.

Most JPEG images are produced by digital cameras, which are optimized to preserve as much information as possible in order to allow the image to be edited and post-processed.

Mac file compression smaller