This dialog box will be displayed when saving a file to a JPEG 2000 file format.
Lossless. Check this options to save a losslessly compressed JPEG 2000 file.
Bit rate %. Enter a percentage of the original size (between 0,05% and 50,00%), or select it using the slider below, to save a lossy compressed JPEG 2000 file.
Uncompressed image size. Shows the uncompressed size of the original image.
Approximate compressed size. Shows the approximate expected size of the lossy compressed JPEG 2000 image, computed using the bit rate specified above and the uncompressed image size.