4:4:4 vs. 4:2:2
Visual Differences Between 444 (RGB) and 422 (YUV) Chroma
In the examples below we illustrate the visual differences between 4:2:2 and 4:4:4 chroma. The upper example is a 100% crop of an HD image. The image source is an uncompressed PNG. The source image was compressed into both 12-bit CineForm 444 and 10-bit CineForm 422 formats using “Filmscan1″ compression quality. By selecting different radio buttons you can observe the visual differences in the images caused by different chroma resolution.
The white numbers were added to the images later and are simply markers for areas to observe when viewing the chroma comparison.
• It is unlikely you can tell any visual difference between the original uncompressed source and 12-bit CineForm 444. There are no visible compression artifacts and no visible chroma differences.
• You should see big differences in the 4:2:2 image due to its lower chroma resolution. In particular look at regions adjacent to the white numbers 1 – 7.
Note: The images are PNG so they are fairly large. They will take a few moments to load based on the bandwidth of your Internet connection.
Original uncompressed 444 PNG source image (100% crop)CineForm 444 (4:4:4) image compressed at Filmscan1 then exported to PNG (100% crop)
The image below is a crop of the image above plus an interpolation to 200 in Photoshop%. Again it is unlikely you’ll spot any differences between the source PNG and the CineForm 444 images, but the differences in the 422 image caused by lower chroma resolution are clearly evident.
* Source Image from One River Media