The following table shows the compression statistics for the Sheer Y'CbCr 8bv 4:2:2p codec for each of the Kodak images. When encoding Y'CbCr 8bv 4:2:2p images with the Sheer Y'CbCr 8bv 4:2:2p codec, SheerVideo's compression power ranges from 1.81 in image 13 to 2.82 in image 03, averaging 2.43. The space savings for Sheer Y'CbCr 8bv 4:2:2p ranges from 45% to 65%, averaging around 58%.
The Y'CBCR 8bv 4:2:2 format, found in the pixel format '2vuy', is the most common uncompressed video format today. Y'CBCR 8bv 4:2:2 contains only two 8-bit values per pixel. While luma (Y') is represented at every pixel, each pixel only retains a single chroma value, alternating between CB and CR.
Y'CBCR 8bv 4:2:2, the luma component has a nominal range of 220 unsigned integer values, and both chroma components have nominal ranges of 225 offset binary integer values. The chroma range of [16..240]->[-1/2..1/2] allows some play on both ends for out-of-range colors. Likewise, the luma component's [16..235]->[0..1] range leaves footroom at the bottom for subblack colors as well as headroom at the top for superwhite colors. This format is compliant with the International Telecommunication Union's Recommendation BT.601-4, and is used in standard uncompressed Y'CBCR 4:2:2 digital video tape (SMPTE D-1), standard uncompressed digital video links (SMPTE 259M), and professional video equipment.
At the time we performed these tests, there was no uncompressed Y'CBCR 8bv 4:2:2 QuickTime codec available. So we wrote our own QuickTime codec to translate between yuv2 and 2vuy, using the simple standard equations given in Recommendation ITU-R BT.601-4:
Y' = floor(y' x 219 / 255 + 16.5)With this codec, we converted the Y'CBCR 8bw 4:2:2 movie to Y'CBCR 8bv 4:2:2 format.
The Sheer Y'CbCr 8bv 4:2:2 encoder was used with the settings: Millions of Colors, Progressive.
With only 2 byte-size components per pixel, the uncompressed size of each these Y'CBCR 8bw 4:2:2 frames is 2 x 768 x 512 = 786432 bytes.