Yes, it's definitely a good idea to use "raw" images for analysis. And remember that the screen itself (and perhaps the computer that drives it) will apply a transfer function ("gamma") to each component.
To separate the effects of the colour response and the transfer function, I think I would do this:
To separate the effects of the colour response and the transfer function, I think I would do this:
- Test with a single primary colour illuminated a time and always the same value. For example (0,0,0), (160,0,0), (0,160,0), (0,0,160). Subtract the black level from the last three measurements, invert the matrix, then normalize each row to sum to 1.0. This should yield something like a colour correction matrix (for that particular display/camera combination).
- Test with all grey levels from (0,0,0) to (255,255,255). This should reveal the display's transfer function (I assume it's the same for all three components!?)
Statistics: Posted by njh — Wed Jul 30, 2025 5:35 pm