RAW Vs. SRAW..

Started Dec 27, 2007 | Discussions thread
Gao Gao Contributing Member • Posts: 561
Err...no, I didn't say 3 color per pixel in sRAW

Scheme 2 will give (from every 4x4 RAW), a 2x2 sRAW block with 4 green samples, 2 blues and 2 reds, altogether 8 samples versus 16 in the original raw.

Green Plane:
1 1
1 1

Blue Plane:
1 x
x 1

Red Plane:
1 x
x 1

or

x 1
1 x

Where x indicates sample missing. Well I was seeing 3 colors per pixel in the DNG file but not the sRAW CR2 (which I have no idea what the byte stream structure is).

Also, the interpolation of the values may not be simply bilinear. The densely sampled green can be used to estimate local gradient and used to guide the interpolation of both green itself and red. The problem with Scheme 1 (under the assumption of R:G:B=1:2:1) is that the distances between valid samples are unbalanced and can be rather far.

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