Yesterday, I showed you histograms of raw dark-field images from the Sony a7RII with release 3.30 firmware with ISO’s between 100 and 1600. The red and blue channels looked pretty similar to the FW 1.0 images I made last year. However, the green channels did not. The uncompressed green channels were more ragged, and the compressed ones evidenced 12-bit precision, not the 13-bit results that we saw with the red and blue channels under FW 3.3, and all the channels under FW 1.0.
Today, we’ll look at the dark-field histograms from 3200 to 25600.
We find that the 12-bit precision of the green channels continues in general, but there are parts of the histogram where, if the read noise is big enough, we get 13-bit precision. This may be due to raw image processing, but it’s not spatial filtering, THe curves are flat all the way up the ISO scale to 25600:
And now, with no further ado, and with minimal commentary, here are the histograms: