"Lossless" means that after you extract a compressed file, every bit in the extracted copy is exactly the same as in the
original. Although this version can auto-detect and compress sound in .669 and .WAV
format, N-bit images if N<>24, and any other files, it was made for compressing 24-bit-True-Color
It can't handle other image formats except uncompressed *.BMP, *.RAS, *.TGA, and some *.TIF files - other images will be recognized as general
data. It is not very good for handmade pictures, but on natural images it gives about 30% better results (using nearly the same time!) than famous
PNG algorithm which used to be considered the best lossless one available.
Remember that neither JPEG nor GIF are lossless formats for True Color images, TIFF and PNG are
lossless. (from JPEG image compression FAQ, part 1/2: ...Thus, JPEG is intended for compressing images
that will be looked at by humans. If you plan to machine-analyze your images, the small errors introduced by JPEG may be a problem for you, even
if they are invisible to the eye.
...The real disadvantage of lossy compression is that if you repeatedly compress and decompress an image, you lose a little more quality each
This version has 16 commands with 44 options, including ability to convert every given file to .ERI (and
back) OR to add/extract all given files to/from an .ERI archive, various transformations and parameters for better
compression, multiple volumes support, password encryption, environment variable
ERI_SW usage, list files support, data protection, base and work directories assignment, 6 compression methods, and many