RAF files from older 16-megapixel X-trans cameras are about 30MB. Compressed RAF files from newer 24-megapixel cameras are about 20MB. Given the size savings, it would be nice if uncompressed files could be converted into the compressed format. How can this be done?
Compression using conventional file compression algorithms cuts the file size approximately in half. However, such files cannot be previewed or processed without decompression.
File-system level compression is not helpful because it is not supported by all file systems. It also still suffers from effects of large file sizes, such as reduced transmission speeds.
Although DNG supports compression, the X-trans sensor layout and color balance are not well preserved after conversion to DNG. DNG allows the original raw to be embedded to work around such issues, but doing so eliminates any potential compression size savings.