Tag Archives: video ratio

Different Aspect Ratio of 4:1:1, 4:2:2, 4:4:4, 4:4:4:4, 4:3, 16:9

Nov 23rd, 2011by Boren 5,584 views |Comments Off

4:1:1

A ratio used to describe the sampling frequency of a digitized signal. The ratio describes luminance is sampled at 3.37 MHz 4 times, while the color is sampled 1 time at 3.37 MHz in each of the separate parts. DV, DVCAM and DVCPRO25 use 4:1:1 color sampling. Formulated as: Y (luminance) is sampled at 13.5 MHz (or 3.37 x 4), R-Y (color) is at 3.37 MHz (or 3.37 x 1) sampled, B-Y (color) is set to 3.37 MHz (or 3.37 x 1) equals 4:1:1. Read More »