Originally posted by biz-engineer In the end, all terminals (Plasma, LCD, OLED , and printed) treat information and display color according to juxtaposed RGB pixels (not stacked).
So, when pixel shifted stacks are converted to JPEG, the image stack is actually downsampled from 144Mp RGB back to 36Mp RGB. But the RAW stack could be converted as is, into 144Mp JPEG, it wouldn't resolve true 144Mp anyway, but the pixel count would be there.
Pixel Shift (PS) is not a stacking process. PS is a compositing process where the missing color values in the Bayer pattern come from the other shots. Therefore the PS output has 3 recorded (real) color values at every pixel location rather than having to interpolate
2/3 of the color values as the standard Bayer pattern requires. For the K 1, there are 36 million pixels with or without PS. Or 36 million color values versus 108 million for PS.
Forgetting movement between shots, the final PS image has more consistent s/n. The Bayer pattern interpolation image has noise induced because interpolation does not match what should be for those color values.
There a number of threads where this discussed. If output of the raw converter is to a non-lossy compression format, there will be 108 million color values for 36 million pixel locations. Jpg is lossy but there will be the same number but the compression distorts them.
RONC