On Mon, January 26, 2009 12:52 am, Wolfgang Hugemann wrote: > JPEG-Colorspace: 2 > JPEG-Sampling-factors: 2x2,1x1,1x1 > > I bet that JPEG Colorspace no. 2 is RGB (?). But I am really confused by > the sampling factors, which I attribute to Y, Cr, Cb. Now, Y should not > be sub-sampled at all and Cr and Cb should be subsampled either by the > factor 2 (when counting in just one direction) or 4 (when counting the > amount of pixels). > > So what does the above line this really tell us? I could not find any > detailed explanation for the output of 'identify'.
I've always read that as: For every 2x2 set of Y samples, there's a 1x1 set of Cr and Cb sample(s). In other words, just what you'd expected - Cb and Cr are sampled at a rate 1/4 (in 2d) of the Y samples. _______________________________________________ Magick-users mailing list [email protected] http://studio.imagemagick.org/mailman/listinfo/magick-users
