J2K
David Ekholm
j2k is a free Photoshop plug-in for reading and writing the JPEG 2000 file format, the successor to JPEG. Also known as JP2, JPEG 2000 uses wavelet compression as opposed to the DCT compression used in standard JPEG. The end result is better image quality in a smaller file. JP2 also includes mandatory metadata such as information about an image's color space.