> Essentially the entire JPEG compression happens after an image
> is split into grayscale channels though. The color space conversion
> isn't used to increase compression.

Yes it is.  Usually, in the new colour space, two of the channels are scaled 
by 50% as a first step that vastly decreases the file size.  You would never 
be able to get this much compression with RGB without the result looking 
much worse.

Post a reply to this message