The .j2k file extension is a raster bitmap image file type that is used by Joint Photographic Experts Group (JPEG) 2000 files. The JPEG 2000 format uses wavelet-based image compression instead of the DCT (Discrete- Cosine- Transform) compression and stores metadata. The metadata or the description information of the .j2k file is coded in XML as compared to the standard .jpeg or .jpg format that are basically formatted with EXIF data.
JPEG 2000 files are saved with a .j2k extension but typically, they can also be in either JP2 or JPX extension. For Windows, JPEG 2000 files can be open using the most popular image viewers and editors like the ones pioneered by Adobe and Corel. Though they are still not as common as standard JPG files, J2K files can support 16-bit color, alpha transparency, and lossless compression.
For Mac users, they can view and/ or edit the .j2k files by utilizing the following software: ToyViewer, Lemkesoft GraphicConverter, Adobe Photoshop CC 2015, Adobe Photoshop Elements 14, and Apple QuickTime Player.
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If you have additional information about the J2K file format or software that uses files with the J2K suffix, please do get in touch - we would love hearing from you.