.J2K File Extension
JPEG 2000 Image
| Developer | Joint Photographic Experts Group |
| Popularity |
3.6 | 9 Votes |
| Category | Raster Image Files |
| Format | Binary |
What is a J2K file?
A J2K file is a compressed bitmap image saved in the JPEG 2000 format. It supports 16-bit color and alpha transparency and may incorporate lossy or lossless compression. J2K files typically store digital photos.
The Joint Photographic Experts Group (JPEG) committee created the JPEG 2000 format in 2000 to replace the JPEG format. However, few applications and platforms adopted the format, and the JPEG format is still overwhelmingly favored.
There are several differences between J2K files and JPG files. For example, J2K files use wavelet compression instead of the Discrete Cosine Transform (DCT) compression used by standard .JPEG images. Also, J2K files store metadata that describes the image in the XML standard instead of the Exchangeable Image File Format (EXIF).
NOTE: JPEG 2000 images may be saved with file extensions other than .j2k. Other common extensions include .jp2 (.JP2 files) and .jpx (.JPX files).
How to open a J2K file
You can open a J2K file with various image viewing and editing applications, including:
- Adobe Photoshop (Windows and macOS)
- CorelDRAW Graphics Suite (Windows and macOS)
- Apple Preview (bundled with macOS)
- Canvas GFX Canvas X Pro (Windows)
How to convert a J2K file
Various applications, including Adobe Photoshop, CorelDRAW Graphics Suite, and Apple Preview, can convert J2K files to other formats.
For example, Adobe Photoshop can convert J2K files to many file types, including the following formats: